**Four identical particles of equal masses 1 kg made to move along the circumference of a circle of radius 1 m under the action of their own mutual gravitational attraction. The speed of each particle will be **

**\(A) \space\sqrt{ (1+2\sqrt2)G\space \over2}\)**

\(B) \sqrt{ G(1+2\sqrt2)}\)

\(C) \sqrt { {G\over2} (2\sqrt2-1)}\)

\(D) \sqrt {{G\over2} (1+2\sqrt2)}\)