How does the volume of a cylinder with a radius of 4 units and a height of 12 units compare to the volume of a rectangular prism with dimensions 8 units x 8 units x 6 units?

A. You cannot compare the volumes of different shapes.
B. The volume of the cylinder is smaller than the volume of the prism.
C. The volume of the cylinder is greater than the the volume of the prism.
D. The volume of the cylinder is the same as the volume of the prism.