GRE Question of the Day (March 29)

Which of the following statements must be true?

Indicate  such statements.

A. The number of males majoring in physical sciences is greater than the number of females majoring in that area.
B. Students majoring in either social sciences or physical sciences constitute more than 50 percent of the total enrollment.
C. The ratio of the number of males to the number of females in the senior class is less than 2 to 1.