Those lines in the circle are both radius'. The radius is 3. I'm supposed to find the area of the sector. How do I solve this?

Is the answer:

a. $\displaystyle 3\pi$

b. $\displaystyle \frac{9\pi}{4}$

c. $\displaystyle \frac{3\pi}{4}$

d. $\displaystyle 9\pi$