Which of the following, if true, would most strengthen the claim that a city's new bus lanes reduced traffic congestion?
Correct answer: B. Congestion fell in the city while remaining unchanged in comparable cities without bus lanes
- A. The lanes were expensive to build
- B. Congestion fell in the city while remaining unchanged in comparable cities without bus lanes
- C. Many residents say they like the lanes
- D. Bus ridership figures were not recorded
Explanation
A comparison with similar cities that did not change rules out general causes such as fuel prices or the economy, which makes the link to the bus lanes far more credible. Opinions and costs are not evidence about congestion. Missing data weakens rather than strengthens a claim.
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About Critical Thinking
Critical thinking examines how conclusions follow from evidence, including claims, assumptions, arguments, inferences and relevant facts. Questions ask you to identify hidden assumptions, distinguish strong from weak evidence, assess cause and effect, recognise common reasoning errors, and decide which statement strengthens or weakens an argument.
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