If uncertainty in position and momentum are equal, then uncertainty in velocity is -

Question

( A ) $\frac{1}{2}m\sqrt{(\frac{h}{\pi})}$
( B ) $\sqrt{(\frac{h}{2\pi})}$
( C ) $\frac{1}{m}\sqrt{(\frac{h}{\pi})}$
( D ) $\sqrt{(\frac{h}{\pi})}$