$A$ body moves along a circular path of radius $15 \ cm$. It starts from a point on the circular path and reaches the end of the diameter in $3 \ s$. The angular speed of the body in $rad/s$ is
- A$\frac{\pi}{2}$
- B$\frac{\pi}{3}$
- C$\frac{\pi}{4}$
- D$\frac{\pi}{5}$
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