If the distance between the centres of Earth and Moon is $D$ and mass of Earth is $81\, times$ that of Moon. At what distance from the centre of Earth gravitational field will be zero?

  • A

    $\frac{D}{2}$

  • B

    $\frac{2D}{3}$

  • C

    $\frac{4D}{5}$

  • D

    $\frac{9D}{10}$

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