A solid consists of a circular cylinder with a right circular cone exactly fitted on the top. The height of the cone is h. If the total volume of the solid is three times the volume of the cone, then the height of the circular cylinder is

A

$$\frac{1}{3}$$h

B

$$\frac{1}{2}$$h

C

$$\frac{2}{3}$$h

D

$$\frac{3}{5}$$h