A wheel having moment of inertia $2 kg–m ^{2}$ about its vertical axis, rotates at the rate of 60 rpm about the axis. The torque which can stop the wheel's rotation in one minute would be :-

Question

( A ) $\frac {2\pi} {15} N-m$
( B ) $\frac \pi {15} N-m$
( C ) $\frac {\pi} {18} N-m$
( D ) $\frac {\pi} {12} N-m$