Two charges $q_1$ and $q_2$ are placed 30 cm apart, as shown in the figure. A third charge $q_3$ is moved along the arc of a circle of radius 40 cm from C to D. The change in the potential energy of the system is $\frac{q_3}{4\pi \epsilon_0}k$ , where k is –

Question

( A ) $6q_2$
( B ) $8q_2$
( C ) $6q_1$
( D ) $8q_1$