In terms of formulas used to compute volume, a pyramid is to a rectangular solid just as a cone is to a cylinder.

The volume of a rectangular solid is always less than the volume of a pyramid with the same base and height, just as the volume of a cylinder is always less than the volume of a cone with the same base and height.

B.

The volume of a pyramid is equal to the volume of a rectangular solid with the same base and height, just as the volume of a cone is the equal to the volume of a cylinder with the same base and height.

C.

The volume of a pyramid is one-third the volume of a rectangular solid with the same base and height, just as the volume of a cone is one-third the volume of a cylinder with the same base and height.

D.

The volume of a rectangular solid is one-third the volume of a pyramid with the same base and height, just as the volume of a cylinder is one-third the volume of a cone with the same base and height.