$A$ and $B$ are two like parallel forces. A couple of moment $H$ lies in the plane of $A$ and $B$ and is contained with them. The resultant of $A$ and $B$ after combining is displaced through a distance :

Question

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