medium · GMAT Verbal Reasoning
A fitness center began offering complimentary post-workout protein shakes to all members. Surprisingly, data showed that members' average total calorie intake on days they visited the gym rose by more than the calories contained in the shake itself.
Which of the following, if true, best explains this phenomenon?
- The shakes turned out to contain noticeably more calories than most members had initially assumed they would.
- The protein shakes were offered to members in several different rotating seasonal flavors each week.
- Members felt that the shake's healthy reputation justified eating more indulgent foods elsewhere that day.
- The gym also chose to raise its monthly membership fees quite substantially during this same measurement period.
- Most members drank the complimentary shake immediately after exercising rather than later in the day.
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