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 is more strategic than many realize, requiring runners to expend mental energy thinking about race tactics.
B. Many cross-country runners are also members of the track-and-field team, for which the average grade point average is actually lower than that of the school as a whole.
C. The cross-country team is among the few teams that do not require a try-out, making it a popular activity for high-achieving students who want to list a sport on their college applications.
D. Because the nearest cross-country trails are a long distance from the school, cross-country is one of the most time-consuming activities the school offers.
E. The cross country team's average grade point average has dropped each of the last three years.
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