The potential at the centroid of an equilateral triangle of side $$r\sqrt 3 $$  due to three equal positive point charges each of value q and placed at the vertices of the triangle would be:

A. $$\frac{q}{{2\pi { \in _0}r}}$$

B. $$\frac{{\sqrt {3q} }}{{8\pi { \in _0}r}}$$

C. $$\frac{{3q}}{{4\pi { \in _0}r}}$$

D. Zero

Answer: Option C