In the circle above, if OA and BC are parallel, and radius OA of the circle is 3, what is the length of minor arc AD?
A) \frac{3}{2} Pi
B)2 Pi
C)\frac{5}{2} Pi
D)3 Pi
E)6 Pi
A) \frac{3}{2} Pi
B)2 Pi
C)\frac{5}{2} Pi
D)3 Pi
E)6 Pi