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?

  1. A survey of frequent flyers found that most switched to booking directly specifically to qualify for the new bonus miles.
  2. The airline also updated the visual design of its mobile app during the same quarter.
  3. 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.
  4. The airline's on-time arrival rate improved slightly during the same quarter.
  5. Overall industry-wide air travel demand grew modestly during the quarter.

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