Two capacitors $C_1$ and $C_2$ are charged to $120\: V$ and $200\: V$ respectively. It is found that by connecting them together the potential on each one can be made zero. Then:

Question

$\begin {array} {1 1} (A)\;3C_1=5C_2 & \quad (B)\;4C_1 = 5C_2 \\ (C)\;5C_1 = 3C_2 & \quad (D)\;5C_1 = 4C_2 \end {array}$