A fruit salad recipe requires 20 cups of blueberries, 22 cups of strawberries, and 18 cups of grapes. To make a batch with 3 cups of grapes, how many cups of berries are needed in all?
A. 7 cups
B. 6 cups
C. 5 cups
D. 4 cups
(I think it is B, but can someone help me confirm)