Answer:
D
Explanation:
This figure is made up of cubes, so if we compute the volume of each cube and multiply it by the number of cubes there are, we should get our answer.
The volume of a cube is denoted by:
, where s is the side length. Here, s = 2, so the volume of one cube is:

inches cubed
Count how many cubes there are: 8.
Multiply 8 by 8: 8 * 8 = 64 cubic inches.
Hope this helps!