15) Which of the following is a true statement? * *

A. Every face a prism is also a base of the prism.

B. Prisms, pyramids, cylinders, cones, and spheres are all solids.

C. Prisms, pyramids, cylinders, cones, and spheres are all polyhedra.

D. Prisms, pyramids, cylinders,
cones, and spheres are all solids with curved surfaces.​