c
In the first case, \(3 \mathrm{C}\) and \(2 \mathrm{C}\) are parallel. Equivalent capacitance is,

\(\frac{c}{3}+\frac{c}{2}=\frac{5 c}{6}\)

In the second case \(1 \mathrm{C} \& 4 \mathrm{C}\) are parallel.

Equivalent capacitance \(=\frac{C}{1}+\frac{C}{4}=\frac{5 C}{4}\)

Ratio \(=\frac{5 \mathrm{C}}{6} \times \frac{4}{5 \mathrm{C}}=2: 3\)