medium · GMAT Verbal Reasoning
A researcher observes that city traffic decreased by 10% after a new bike lane was installed and concludes that the bike lane caused the reduction.
Which of the following, if true, most weakens this conclusion?
- Bicycle ridership across the city rose quite sharply in the months after the new lane opened.
- The city raised the price of downtown parking by 50% at the same time the bike lane was installed.
- Traffic also decreased in several other nearby cities that did not install any new bike lanes.
- Many of the city's citizens reported in surveys that they greatly enjoy using the new bike lane.
- The bike lane ended up costing less to install than the city had originally planned and budgeted.
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