Alana feels that the fact that her best friend borrows her notes from class, is always running late, and sometimes doesn't laugh at her jokes, is made up for by the fact that she is always willing to listen, always lets Alana borrow her CD's,

and gives her rides everywhere. Alana feels there is ________ in the relationship.
A) social exchange
B) equity
C) a reinforcement-affect effect
D) communality

Answer: B