Answer: c. Compare baseline levels of appearance concerns in fraternity/sorority students versus the average college student.
Explanation:
If Dr. Falkner is concerned that people who choose to join fraternities and sororities are worried about their appearance overall which means that they were worried about their appearance before they joined those groups, he can check how they measure up to their peers in this regard as this would show whether their concern for their appearance is normal for their social position or not.
This test can be conducted by the method described in the answer. The result would show how much in relation to their peers, people who join fraternities and sororities worry about appearance.
