Kyle uses a school gym to run a weekly yoga class. He must pay the school a fee for the use of the gym. Each person who comes pays x dollars. The amount of profit Kyle makes can be represented by the expression: nx−d
What does the term nx represent?

A
the fee for the use of the school gym

B
the number of people in the yoga class

C
the cost of the yoga class for each person attending the class

D
the total money Kyle collects from people attending the class