Find the Area of the Region That Lies Inside the First

Multiple Choice

Find the area of the region that lies inside the first curve and outside the second curve. Select the correct answer.
$$r = 3 \cos \theta , \quad r = 1 + \cos \theta$$

A) $A = 2 \pi$
B) $A = \pi$
C)
$A = \frac { 3 \pi } { 2 }$
D)
$A = \frac { \pi } { 4 }$
E)
$A = \frac { \pi } { 2 }$