If $\theta$ is the angle between $\overrightarrow{a}$ and $\overrightarrow{b}$ and $|\overrightarrow{a} \times \overrightarrow{b} | = |\overrightarrow{a}. \overrightarrow{b}|$, then $\theta$ is equal to :

Question

( A ) $\pi$
( B ) $\frac{\pi}{4}$
( C ) $\frac{\pi}{2}$
( D ) $0$