If $\overrightarrow{a} $ and $\overrightarrow{b}$ are unit vectors such that $|\overrightarrow{a} \times \overrightarrow{b}| = \overrightarrow{a}.\overrightarrow{b}$, then $|\overrightarrow{a} + \overrightarrow{b}|^2$ is equal to :

Question

( A ) $2$
( B ) $\sqrt{2}$
( C ) $2+\sqrt{2}$
( D ) $2-\sqrt{2}$