The mean radius of the earth's orbit round the sun is $1.5 \times 10^{11}.$ The mean radius of the orbit of mercury round the sun is $6 \times10^{10}\,m.$ The mercury will rotate around the sun in

  • A

    A year

  • B

    Nearly $4$ years

  • C

    Nearly $\frac{1}{4}$ year

  • D

    $2.5$ years

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