Solve this problem using estimation. Round the number of cupcakes to the nearest ten and the cost of the cupcakes to the nearest 10 cents. Melissa bought 18 cupcakes and 2 gallons of fruit punch for her Valentine party. The cupcakes cost $0.33 each, and the punch costs $2.78 a gallon. Estimate the cost of the cupcakes.
A. $10
B. $15
C. $20
D. $25