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Question 1. An argument states that because the city’s public transportation usage has risen 15 % over the past year, traffic congestion must have decreased. Which of the following, if true, would most weaken the argument? A) The city added 10 % more lanes to its highways during the same period. B) The number of registered vehicles in the city increased by 20 % over the past year. C) The city’s bus routes were extended to previously underserved neighborhoods. D) Traffic congestion is measured by average travel time during rush hour. Answer: B Explanation: If vehicle registrations rose 20 %, the increase in public-transport usage may be insufficient to offset the added cars, undermining the claim that congestion has decreased. Question 2. Which of the following is a necessary assumption for the argument that “All students who study with flashcards score higher on exams, therefore using flashcards causes higher scores”? A) Students who study with flashcards also tend to study longer. B) The exam difficulty remained constant across all test-takers. C) There is no other factor that influences both flashcard use and exam scores. D) Flashcards are the only study method used by high-scoring students. Answer: C Explanation: For the causal claim to hold, it must be assumed that no other variable explains both flashcard use and higher scores; otherwise the relationship could be spurious.
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Question 3. In the passage, the author’s main conclusion is that “Mandatory voting laws increase civic engagement.” Which of the following best identifies a premise supporting this conclusion? A) Countries with mandatory voting have higher voter turnout than those without. B) Mandatory voting reduces the number of spoiled ballots. C) Citizens who vote are more likely to attend town-hall meetings. D) Mandatory voting is enforced by fines for non-compliance. Answer: A Explanation: The premise directly links mandatory voting to higher turnout, which the author uses as evidence that civic engagement rises. Question 4. Which of the following most strongly supports the claim that “Organic farming yields less produce than conventional farming because it avoids synthetic fertilizers”? A) Studies show that organic farms use compost and crop rotation to enrich soil. B) Synthetic fertilizers increase nitrogen availability, which boosts plant growth. C) Consumers are willing to pay higher prices for organic produce. D) Some organic farms have adopted bio-fertilizers derived from natural sources. Answer: B Explanation: The statement explains why synthetic fertilizers improve yields, thereby supporting the claim that avoiding them leads to lower output. Question 5. The argument concludes that “Since the company’s profits rose after implementing a four-day workweek, the reduced schedule caused the profit increase.” Which of the following, if true, would most weaken this inference?
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D) If a publisher releases a book in paperback, readers will find it more affordable, increasing sales. Answer: D Explanation: Both arguments follow the pattern: Action → Direct effect → Indirect benefit (price reduction → increased sales). Question 8. Which of the following is a sufficient assumption for the argument that “All plants that receive at least six hours of sunlight each day will survive the winter”? A) No plant can survive the winter without sunlight. B) Six hours of sunlight is the minimum requirement for photosynthesis. C) All plants in the study were watered regularly. D) The winter temperatures are not extreme enough to kill any plant. Answer: D Explanation: If temperatures are mild enough that sunlight alone determines survival, then the claim holds; this assumption guarantees the argument’s validity. Question 9. The author claims that “Implementing a universal basic income would eliminate poverty because every individual would receive enough money to meet basic needs.” Which of the following, if true, most seriously challenges this claim? A) Some individuals might misuse the funds on non-essential items. B) The cost of a universal basic income would require raising taxes significantly. C) The definition of “basic needs” varies across cultures. D) Inflation could rise if everyone suddenly has more purchasing power. Answer: D Explanation: Inflation could erode the purchasing power of the basic income, preventing it from meeting basic needs, directly undermining the claim.
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Question 10. Which of the following best identifies the method of reasoning used in the argument that “Since the number of cyber attacks has risen after companies adopted remote work, remote work must be the cause of the increase”? A) Analogical reasoning. B) Causal reasoning based on correlation. C) Statistical generalization. D) Reasoning by elimination. Answer: B Explanation: The argument infers causation from a temporal correlation between remote work adoption and cyber attacks. Question 11. The passage argues that “Because renewable energy sources are intermittent, the grid must rely on natural-gas peaker plants, which defeats the purpose of clean energy.” Which of the following, if true, would most strengthen this argument? A) Battery storage technology is currently too expensive for large-scale deployment. B) Some countries have successfully integrated high percentages of renewables without peaker plants. C) Natural-gas plants emit less carbon than coal plants. D) Renewable energy costs have fallen dramatically over the past decade. Answer: A Explanation: If storage is too costly, the grid cannot smooth intermittency, forcing reliance on peaker plants and supporting the author’s claim. Question 12. Which of the following is an example of a “circular reasoning” flaw?
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C) Social media reshapes campaigning while simultaneously deepening political polarization. D) Voter turnout has declined due to online misinformation. Answer: C Explanation: The passage’s central claim is that social media both changes campaigning and intensifies polarization. Question 15. The author argues that “Since the new law reduces the speed limit on highways, traffic fatalities will decline.” Which of the following is a necessary assumption? A) Drivers will obey the lower speed limit. B) The law applies to all highways nationwide. C) Speeding is the primary cause of traffic fatalities. D) Enforcement resources will increase after the law’s passage. Answer: C Explanation: For the speed-limit reduction to lower fatalities, it must be assumed that speed is the main cause of those deaths. Question 16. Which of the following would most strengthen the claim that “Implementing a four-day workweek improves employee productivity”? A) Companies that switched to a four-day week reported higher employee satisfaction. B) Studies show that employees work longer hours on the four-day schedule. C) Productivity metrics rose 12 % after the schedule change, while output per hour remained constant. D) The four-day workweek reduces operational costs for businesses. Answer: C Explanation: Direct evidence that productivity increased after the schedule change directly supports the claim.
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Question 17. The argument concludes that “Because the city’s crime rate fell after installing more streetlights, the streetlights caused the reduction.” Which of the following, if true, would most weaken this conclusion? A) The police department increased patrols in the same neighborhoods at the same time. B) Residents reported feeling safer after the streetlights were installed. C) Crime rates in neighboring cities without new streetlights also fell. D) The city also opened new community centers during that period. Answer: C Explanation: If crime fell elsewhere without streetlights, the reduction cannot be uniquely attributed to the lighting. Question 18. Which of the following best illustrates the principle “If a policy solves one problem but creates a larger problem, it should be rejected”? A) A tax cut stimulates the economy but widens the budget deficit. B) A vaccine prevents disease but has minor side effects. C) A speed limit reduces accidents but increases travel time. D) A university raises tuition to fund scholarships for low-income students. Answer: A Explanation: The policy’s benefit (economic boost) is outweighed by the larger issue (budget deficit), matching the principle. Question 19. In a “most strongly supported” inference question, the stimulus says that “All the participants who completed the training program reported feeling more confident, but only 60 % passed the certification exam.” Which of the following can be most strongly inferred? A) The training program improves confidence but does not guarantee exam success.
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Answer: A Explanation: Serious side effects undermine the claim that the drug is safe, despite its efficacy. Question 22. Which of the following best identifies a “correlation vs. causation” error in the following statement: “Cities with higher numbers of coffee shops also have higher rates of creative industries; therefore, coffee shops cause creativity.” A) Assuming that the presence of coffee shops directly influences creativity. B) Overgeneralizing the relationship to all types of businesses. C) Ignoring the possibility that both variables are linked to a third factor. D) Claiming that coffee consumption is higher in creative cities. Answer: A Explanation: The statement directly attributes causation to a mere correlation. Question 23. An argument claims that “Because the policy requires all employees to submit weekly reports, management will have better insight into project progress, leading to higher project success rates.” Which of the following, if true, would most strengthen this claim? A) Companies that implemented weekly reporting saw a 15 % increase in on-time project completion. B) Employees report feeling micromanaged under the weekly reporting system. C) Weekly reports reduce the amount of time employees spend on actual work. D) Management already receives daily updates via instant messaging. Answer: A Explanation: Empirical evidence that weekly reporting correlates with higher success directly supports the argument.
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Question 24. Which of the following best describes the logical structure of the argument: “If a country reduces its carbon emissions, it will meet its international climate commitments; therefore, the country must adopt stricter emissions standards.” A) Modus ponens. B) Modus tollens. C) Disjunctive syllogism. D) Hypothetical syllogism. Answer: A Explanation: The argument follows the form: If P, then Q; P; therefore Q (modus ponens). Question 25. The passage argues that “Because the ancient philosopher emphasized virtue as the highest good, modern ethics should prioritize character over consequences.” Which of the following, if true, would most weaken this conclusion? A) Contemporary ethical theories often integrate both virtue and consequentialist elements. B) The philosopher’s works were primarily focused on political organization. C) Modern societies value outcomes such as health and safety more than personal virtue. D) Virtue ethics lacks a clear method for resolving moral dilemmas. Answer: C Explanation: If modern societies prioritize outcomes, the claim that virtue should be prioritized is undermined. Question 26. Which of the following would most weaken the claim that “Providing free public Wi-Fi in low-income neighborhoods will close the digital divide”?
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Answer: A Explanation: The statement presents only two alternatives while ignoring other possibilities. Question 29. The argument claims that “Since the airline’s on-time performance improved after introducing a new scheduling algorithm, the algorithm is responsible for the improvement.” Which of the following, if true, would most weaken this claim? A) The airline also hired additional pilots during the same period. B) Passenger satisfaction scores increased after the algorithm’s implementation. C) The algorithm reduces fuel consumption by 5 %. D) The airline reduced its number of flights per day. Answer: A Explanation: Additional pilots could explain better on-time performance, offering an alternative cause. Question 30. Which of the following is a sufficient condition for the conclusion “If a student studies at least three hours per day, they will earn an A in the course”? A) The course’s grading rubric awards an A only to students who study three or more hours daily. B) All students who study three hours daily have previously earned A’s in other courses. C) The professor grades based solely on attendance. D) The course material is considered easy by most students. Answer: A Explanation: If the rubric guarantees an A to anyone meeting the study time, then the condition is sufficient.
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Question 31. An argument states that “Because the city’s recycling rate rose after a public awareness campaign, the campaign must have been effective.” Which of the following, if true, would most strengthen this argument? A) Surveys show that 80 % of residents recall seeing the campaign messages. B) The city also increased the number of recycling bins during the same period. C) Neighboring cities without campaigns saw no change in recycling rates. D) The campaign cost less than the city’s previous recycling initiatives. Answer: C Explanation: Demonstrating that only the city with the campaign experienced an increase isolates the campaign as the likely cause. Question 32. Which of the following best identifies the author’s primary purpose in a passage that critiques the “one-size-fits-all” approach to educational reform? A) To argue that individualized instruction yields better outcomes than standardized curricula. B) To describe the history of educational policy in the United States. C) To present statistical data on graduation rates. D) To propose a new national testing standard. Answer: A Explanation: The passage’s focus is on arguing against uniform reforms and advocating individualized methods. Question 33. The argument claims that “If a country invests heavily in renewable energy, it will achieve energy independence.” Which of the following is a necessary assumption? A) Renewable energy sources can meet the country’s total energy demand. B) Fossil fuel imports are currently the primary source of energy.
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Question 36. In a “most strongly supported” question, the passage notes that “After the city introduced a bike-share program, downtown traffic congestion decreased by 12 %.” Which of the following statements is most strongly supported? A) The bike-share program directly caused the reduction in congestion. B) Some commuters shifted from cars to bicycles after the program’s launch. C) Traffic congestion in other parts of the city remained unchanged. D) The city also expanded bus routes during the same year. Answer: B Explanation: The data imply a shift in commuting behavior, which plausibly explains the congestion drop; the other options introduce unrelated factors. Question 37. Which of the following is a logical flaw in the statement: “If we ban all plastic bags, plastic waste will disappear; therefore, the ban will solve the plastic-pollution problem”? A) It assumes that all plastic waste originates from plastic bags. B) It overlooks the economic impact on manufacturers. C) It ignores the possibility of illegal bag usage. D) It assumes consumers will switch to reusable bags. Answer: A Explanation: The argument incorrectly equates eliminating one source with eliminating the entire problem. Question 38. The argument asserts that “Because the company’s new software reduces processing time by 30 %, employee productivity will increase proportionally.” Which of the following, if true, would most weaken this claim? A) Employees must undergo a two-week training period before using the software.
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B) The software requires additional data entry steps not present in the old system. C) The company plans to hire more staff to handle increased workload. D) Customer satisfaction scores improved after the software rollout. Answer: B Explanation: Extra data entry could offset time savings, reducing the net productivity gain. Question 39. Which of the following best captures the principle “If an action yields a benefit but also creates a serious risk, the risk must be mitigated before proceeding”? A) The precautionary principle. B) The principle of proportionality. C) The principle of utility. D) The principle of non-maleficence. Answer: A Explanation: The precautionary principle advises addressing serious risks prior to action, even when benefits exist. Question 40. In a parallel reasoning question, the stimulus argues: “If a university raises tuition, it will generate more revenue, allowing it to improve facilities, which will attract higher-scoring applicants.” Which answer choice mirrors this structure? A) If a restaurant lowers prices, it will increase customer volume, enabling it to hire more staff, which improves service quality. B) If a city builds a new highway, traffic flow will improve, reducing commute times for workers. C) If a publisher offers discounts, sales will rise, leading to higher profits. D) If a hospital expands its emergency department, patient wait times will decrease.
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B) “The data clearly show a correlation between X and Y.” C) “We should reject the proposal because it conflicts with tradition.” D) “If we adopt this plan, we will waste resources.” Answer: A Explanation: The critique attacks the person’s credentials rather than the argument’s substance. Question 44. An argument states that “Because the city’s crime rate fell after installing more street cameras, the cameras caused the decline.” Which of the following, if true, would most weaken this inference? A) The city also increased police patrols in the same neighborhoods. B) Residents reported feeling safer after the cameras were installed. C) Crime rates in nearby towns without cameras also fell. D) The cameras recorded a high number of traffic violations. Answer: C Explanation: A broader decline suggests other factors, reducing the attribution to cameras alone. Question 45. Which of the following best describes the method of reasoning used when an author argues that “Since the ancient Romans used arches because arches distribute weight efficiently, modern engineers should incorporate arches into bridge design”? A) Analogical reasoning. B) Deductive reasoning. C) Inductive reasoning. D) Causal reasoning. Answer: A Explanation: The author draws a comparison between past and present practices based on a shared principle.
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Question 46. The passage claims that “Because the novel’s protagonist is unreliable, readers cannot trust the narrative.” Which of the following, if true, would most weaken this claim? A) Unreliable narrators are a common literary device that adds depth. B) The novel includes multiple perspectives that corroborate events. C) The protagonist’s unreliability is revealed only at the end. D) Readers enjoy stories with ambiguous truth. Answer: B Explanation: Additional reliable perspectives counteract the unreliability, allowing readers to trust the overall narrative. Question 47. Which of the following would most weaken the argument that “Implementing a citywide ban on single-use plastics will eliminate plastic pollution in waterways”? A) Plastic micro-fibers from laundry still enter waterways. B) Residents may switch to reusable bags made of non-recyclable materials. C) The ban applies only to retail stores, not restaurants. D) Plastic pollution also originates from industrial runoff. Answer: A Explanation: Even without single-use plastics, other plastic sources continue polluting, challenging the claim of elimination. Question 48. The author argues that “If a country raises the minimum wage, workers will have more disposable income, stimulating economic growth.” Which of the following is a sufficient assumption for this argument? A) Workers will spend the additional income rather than saving it. B) Employers will not reduce hiring because of higher labor costs. C) Inflation will remain stable after the wage increase.
