Two non-conducting solid spheres of radii R and 2R, having uniform volume charge densities p and p2 respectively, touch each other. The net electric field at a distance 2R from the centre of the smaller sphere, along the line joining the centre of the spheres is zero. The ratio p/p2 can be 32 (A)-4 (B)- 25 (C) 32 25 (D) 4