Three identical bodies of equal mass $M$ each are moving along a circle of radius $R$ under the action of their mutual gravitational attraction. The speed of each body is

  • A

    $\sqrt {\frac{{GM}}{R}} $

  • B

    $\sqrt {\frac{{GM}}{3R}} $

  • C

    $\sqrt {\frac{{GM}}{{\sqrt 3 R}}} $

  • D

    $\sqrt {\frac{{GM}}{{\sqrt 2 R}}} $

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