What Do All of the Following Have in Common: Tuition

Multiple Choice

What do all of the following have in common: tuition, fee, premium, retainer, dues?

A) They are all usually paid in cash.
B) They are forms of exchange similar to, but not identical with, money.
C) They are forms of exchange similar to, but not identical with, barter.
D) They are different terms for the concept of price.
E) They have nothing in common.