easy · GMAT Verbal
An airline redesigned its frequent-flyer program to award bonus miles only for bookings made directly on the airline's own website. In the following quarter, direct-website bookings rose 40 percent compared with the same quarter a year earlier. Airline executives concluded that the redesigned program caused the increase in direct bookings.
Which of the following, if true, would most strengthen the executives' conclusion?
- A survey of frequent flyers found that most switched to booking directly specifically to qualify for the new bonus miles.
- The airline also updated the visual design of its mobile app during the same quarter.
- Bookings made through third-party travel agencies, which are not eligible for the new bonus-mile promotion at all, fell only slightly during the same quarter.
- The airline's on-time arrival rate improved slightly during the same quarter.
- Overall industry-wide air travel demand grew modestly during the quarter.
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