During Times of High Unemployment, Colleges Often Observe an Increase

During times of high unemployment, colleges often observe an increase in enrollment even if tuition remains unchanged. Why?

A) Students do not know about the decision pitfalls and go to college even though the net benefit is negative.
B) The opportunity cost of attending college is lower because students are less likely to have good full-time jobs.
C) The opportunity cost of attending college is higher because good jobs are harder to find.
D) The benefit of attending college is lower because college graduates are less likely to find jobs upon graduation.