Answer:
The answer is C or 1/3 (40) ft³.
Explanation:
If you have the volume of a cylinder and want to find the volume of a cone with the same base and height, the volume of a cone will always be 1/3 of a cylinder. So, you would multiply 1/3 by the volume of the cylinder ( in this case, it is 40). So, the answer is C.
The answer is not A, because a cone is not 3 times a cylinder, its the other way around.
Its not B, because the volume of our cylinder is not 1/40.
Lastly, D is also incorrect, because if you have the volume of the cylinder, you do not need to square it in order to find the cones volume.