Two small drops of mercury, each of radius \( r \), coalesce to form a single large drop of radi...

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Two small drops of mercury, each of radius \( r \), coalesce to form a single large drop of radius \( R \). The ratio 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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