THIS IS DUE SOON Use the information to answer the following question.

A local theater sells admission tickets for $9.00 on Thursday nights. At capacity, the theater holds 100 customers. The function M(n) = 9n represents the amount of money the theater takes in on Thursday nights, where n is the number of customers.

What is the domain of M(n) in this context?
A. all whole numbers
B. all non-negative rational numbers
C. all non-negative integers that are multiples of 9
D. all non-negative integers less than or equal to 100