GMAT Critical Reasoning (CR) | Re: A high school has found that, for each of the last 15 years, the avera

[quote="ziyuen"] A high school has found that, for each of the last 15 years, the average grade point average for members of the cross-country running teams has exceeded the average grade point average for the school as a whole. This phenomenon can most likely be attributed to the fact that long distance runners have so much time to think while running that they can essentially study as they run.

Which of the following most undermines the conclusion drawn above?

A. Cross-country running
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