Charge +q and –q are placed at points A and B respectively which are at distance $2L$ apart, C is the midpoint between A and B. The work done in moving a charge + Q along the semicircle CRD is:-

Question

( A ) $\frac{qQ}{2 \pi \epsilon_0L}$
( B ) $\frac{qQ}{6 \pi \epsilon_0L}$
( C ) $\frac{qQ}{4 \pi \epsilon_0L}$
( D ) $-\frac{qQ}{6 \pi \epsilon_0L}$