A Flywheel Rotating at 12 Rev/s Is Brought to Rest $\pi$

Multiple Choice

A flywheel rotating at 12 rev/s is brought to rest in 6 s. The magnitude of the average angular acceleration in rad/s² of the wheel during this process is:

A) 1/ $\pi$
B) 2
C) 4
D) 4 $\pi$
E) 72