Studies Have Shown That Students Who Earn High Grades in College

Studies have shown that students who earn high grades in college will have earned much more over a 40 year period than students who receive low grades.Despite this,surveys show that many students fail to study enough hours outside of the classroom to earn high grades.Which of the following is the best explanation for this?

A) Some students can earn high grades by studying fewer hours than other students.
B) The surveys used to make this observation were based on a non-random sample of students.
C) Because of new technology developed in the 1990s,students can make more efficient use of their study time today than students who attended college before the 1990s.
D) Students overvalue the utility they receive from activities other than studying.

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