Answer:
D
Explanation:
This is a rectangular prism. The volume of a rectangular prism can be found using: 
v=l*w*h 
For this aquarium, the length is 36 inches, the width is 12 inches and the height is 24 inches. Substitute 36 in for l, 12 for w and 24 for h. 
v=36*12*24 
Multiply all the numbers together 
v=10,368 
Volume is always units^3, because we multiply 3 numbers together. The units are inches, so the volume of the aquarium is: 
10, 368 inches^3