General admission to the State Fair of Texas is $16.00. For guests to ride the various rides, they must use coupons needed for each ride varies. The representative function for the situation is C(x) = 0.5x + 16, where C(x) represents total cost as a function of the number of coupons, x. What is the domain for visiting and riding rides at the State Fair of Texas?
A. All integers greater than or equal to 0
B. All real numbers greater than or equal to 0
C. All real numbers
D. All integers greater than or equal to 16