Use a Double Integral to Find the Area Enclosed by the Graph

Multiple Choice

Use a double integral to find the area enclosed by the graph of $r = 3 \cos 3 \theta$

A) $\frac { 3 } { 4 } \pi$
B) $\frac { 4 } { 3 }$
C) $\frac { 9 } { 4 } \pi$
D) $\frac { 9 } { 4 }$
E) $\frac { 4 } { 9 } \pi$