Imagine a light planet revolving around a very massive star in a circular orbit of radius $R$ with a period of revolution $T$. If the gravitational force of attraction between the  planet and the star is proportional to $R^{-5/2}$, then,

  • A

    $T^2 \propto R^2$

  • B

    $T^2 \propto R^{7/2}$

  • C

    $T^2 \propto R^{3/2}$

  • D

    $T^2 \propto R^{3.75}$

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