Two non-conducting solid spheres of radii R and 2R, having uniform volume charge densities $$\rho_1$$ and $$\rho_2$$ respectively, touch each other. The net electric field at a distance 2R from the centre of the smaller sphere, along the line joining the centres of the spheres, is zero. The ratio $$\frac{\rho_1}{\rho_2}$$ can be

A

-4

B

$$-\frac{32}{25}$$

C

$$\frac{32}{25}$$

D

4