Candy is on sale for $0.75 each. You have a coupon for $0.25 off your total purchase. Write a function rule for the cost of n pieces of candy.

A. C(n) = 0.25n - 0.75
B. C(n) = 0.75n - 0.25
C. C(n) = 1.0n
D. C(n) = 0.75n