medium · GMAT Verbal
An airport redesigned its security screening lanes, separating passengers into distinct lines based on their travel experience level, with dedicated lanes for frequent travelers. In the months after the redesign, average wait time across all screening lanes fell from 24 minutes to 15 minutes. Airport officials concluded that the lane redesign caused the reduction in wait times.
Which of the following, if true, most strengthens the officials' conclusion?
- Frequent travelers moved through screening notably faster once separated from less experienced travelers, and this faster flow also reduced backups in the other lanes.
- The airport added several new retail shops near the security checkpoint.
- Overall passenger volume at the airport grew slightly during the same period.
- The airport hired additional screening staff shortly before the redesign for an unrelated reason and kept staffing at the new level throughout the measured period.
- Passengers reported being satisfied with the new lane signage.
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