If $|\overrightarrow{a}| = 3, \; |\overrightarrow{b}| = 4$ and $|\overrightarrow{a} + \overrightarrow{b}| = 1$, then $|\overrightarrow{a} - \overrightarrow{b}|$ is equal to :

Question

( A ) 5
( B ) 8
( C ) 6
( D ) 7