The length of a swimming pool is 22 ft. The width is 40 ft. If the volume of the pool is 2,500 ft³, which equation below could be used to find the depth of the pool?


A. (22 + 40)x = 2500
B. 22 + 40 + x = 2500
C. 66x = 2500
D. 22 • 40 • x = 2500