An athlete throws a discus from rest to afinal angular velocity of `15 rad s^-1` in `0.270 s` before releasing it. During acceleration, discuss moves a circular arc of radius `0.810 m`. Acceleration of discus before it is released is.
A. `45 ms^-2`
B. `180 ms^-2`
C. `187 ms^-2`
D. `192 ms^-2`