If three particle each of mass m are placed at the three corners of an equilational triangle of side I, the work done to increase the side of that triangle 2I is

Options

A. `(3Gm^2)/(l)`
B. `(3Gm^2)/(2l)`
C. `(Gm^2)/(2l)`
D. `(Gm^2)/(l)`

Answer

B