What Do All of the Following Have in Common: Tuition,fee,premium,retainer,dues

Multiple Choice

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

A) They all must be 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.