Answer:
The correct option is 3.
Explanation:
James made the body of a robot out of two cubes.
The side length of larger cube is 10 in. The sum of side length of both cubes is 16 in. So, the side length of smaller cube is

The side length of smaller cube is 6 in.
The volume of cube is

Where, a is side length.
The volume of smaller cube is

The volume of larger cube is

The volume of body of a robot is

The volume of body of a robot is 1216 in³. Therefore the correct option is 3.