Which would most STRENGTHEN: 'Cities that introduced free bicycle-sharing programs saw fewer cars in their central districts.'
ASurveys of bicycle-share users showed that most had previously driven cars to those districts.
BBicycles are cheaper than cars.
CThe cities had pleasant weather.
DCycling is healthier than driving.
Answer & Solution
Correct answer: A. Surveys of bicycle-share users showed that most had previously driven cars to those districts.
To strengthen a causal claim, show the proposed mechanism is operating. (B) directly shows that bike-share users actually shifted from cars — supporting that the program (not something else) caused the reduction. (A) suggests alternative cause. (C, D) are background, not strengthening.
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