If the potential at the centre of a uniformly charged hollow sphere of radius R is V then electric field at a distance r from the centre of sphere will be $\;(r > R)$

Question

$(a)\;\large\frac{VR}{r^2}\qquad(b)\;\large\frac{Vr}{R^2}\qquad(c)\;\large\frac{VR}{R^2+r^2}\qquad(d)\;\large\frac{VR}{r}$