A charge $$Q$$ is uniformly distributed throughout the volume of a non-conducting sphere of radius $$R$$. The total electrostatic energy of electric field inside the sphere is $$U=\alpha\times\frac{Q^2}{4\pi\varepsilon_0R}$$. The value of $$\alpha$$ is

A

Zero

B

$$\frac35$$

C

$$\frac12$$

D

$$\frac1{10}$$