Three identical spheres , each having a charge q and radius R are kept in such a way that each touches the other two. Find magnitude of electric force on any sphere due to other two sphere,

Question

$(A)\;\frac{1}{4 \pi \in _0} \bigg( \frac{q}{R}\bigg)^2\\ (B)\;\frac{\sqrt 3}{16 \pi \in _0} \bigg( \frac{q}{R}\bigg)^2 \\ (C)\; \frac{\sqrt 3}{4 \pi \in _0} \bigg( \frac{q}{R}\bigg)^2 \\ (D)\;\frac{\sqrt 5}{16 \pi \in _0} \bigg( \frac{q}{R}\bigg)^2 $