When 12 marbles are added to a rectangular aquarium, the water in the aquarium rises fff\(1*(\frac{1}{2})\)/fff inches. In total, how many marbles must be added to the aquarium to raise the water fff\(2*(\frac{3}{4})\)/fff inches?
A.16
B.18
C.20
D.22
E.24
我的答案：
