Choose the answer that best represents the situation described below.
Tammy takes a job after school to earn money to buy a violin. She knows that
the more hours she works, the more money she will make.
A. Tammy's job is a function of her interest in music.
B. The number of hours Tammy works is a function of the amount of
money she makes.
C. The amount of money Tammy makes is a function of the number
of hours she works.