Which of the following, if true, would most strengthen the claim that a city's new bus lanes reduced traffic congestion?
- 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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