Two small drops of mercury, each of radius $R$ coalesce to form a single large drop. The radio of the total surface energies before and after the change is

  • A

    $1 : 2^{1/3}$

  • B

    $2^{1/3} : 1$

  • C

    $2 : 1$

  • D

    $1 : 2$

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