Suppose tuna is on sale for $0.90 a can, and you have a coupon for $0.40 off your total purchase. Write a function rule for the cost of n cans of tuna.
A. C (n) = 0.90n-0.40
B. C (n) = 0.40n-0.90
C. C (n) = (0.90+n) - 0.40
D. C (n) = (0.40+n) - 0.90
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