Solve the Problem $x = r$ , The $x$ -Axis, and the Line

Multiple Choice

Solve the problem.
-A right circular cylinder is obtained by revolving the region enclosed by the line $x = r$ , the $x$ -axis, and the line $y = h$ , about the $y$ -axis. Find the volume of the cylinder.

A) $\pi \mathrm { rh } ^ { 2 }$
B) $\pi \mathrm { rh }$
C) $2 \pi r ^ { 2 } h$
D) $\pi r ^ { 2 } h$