Which of the Following Makes the Best Hypothesis

Which of the following makes the best hypothesis?

A) Freshmen are more likely than seniors to report feeling homesick, unfulfilled, lonely, and dissatisfied with their college experience than are seniors.
B) Juniors who meet with their counselor every semester are more likely to have high GPAs than seniors who meet with their counselor once a year.
C) College students prefer big universities more than small universities.
D) Seniors who identify themselves as "undecided" about their career goals are more likely to add a second major than are seniors who report being "very clear" about their career goals.