A charge $$(-2Q)$$ is distributed uniformly on a spherical balloon of radius $$R$$. Another point charge $$(+Q)$$ is situated at the centre of the balloon. The balloon is now inflated to twice the radius. Neglecting the elastic energy involved in the process, the change in total electric energy of the system is

A

$$\frac{-Q^2}{2\pi\varepsilon_0 R}$$

B

$$\frac{-Q^2}{4\pi\varepsilon_0 R}$$

C

$$\frac{+Q^2}{4\pi\varepsilon_0 R}$$

D

zero