Customers can download books from an online bookstore for $8 each after paying $150 for an e-book reader. The total amount of money a customer spends on x books and the e-book reader can found using f(x)=8x+150. What is the range of f in this situation?
A. All integers greater than or greater to 0
B. All real numbers greater than or equal to 150
C.(150,158,166,174,...)
D.(158,159,160,161,...)