Two condensers, one of capacity C and the other of capacity $\frac{\mathrm{C}}{2}$, are connected to a V-volt battery , as shown.

The work done in charging fully both the condensers is : 

• A

  $\frac{1}{2}{\mathrm{CV}}^2$

• B

  $2{\mathrm{CV}}^2$

• C

  $\frac{1}{4}{\mathrm{CV}}^2$

• D

  $\frac{3}{4}{\mathrm{CV}}^2$