A spherical drop of water carrying a charge of $30\; pC$ has a potential of $500\; V$ at its surface (with V = 0 at infinity). Choose the correct statement from the following: (A) the radius of the drop is $5.4 \times 10^{-4 }m$ (B) If two such drops of the same charge and radius combine to form a single spherical drop, then the potential at the surface of the new drop is nearly $790\; V $ (C) the radius of the drop is $7.4 \times 10^{-4}\; m$ (D) If two such drops of the same charge and radius combine to form a single spherical drop, then the potential at the surface of the new drop is nearly $590\; V $

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