In the circuit shown here \[{{C}_{1}}=6\mu F,\ {{C}_{2}}=3\mu F\]and battery\[B=20V\]. The switch \[{{S}_{1}}\] is first closed. It is then opened and afterwards \[{{S}_{2}}\] is closed. What is the charge finally on \[{{C}_{2}}\]

• A.                    \[120\mu C\]
• B.                    \[80\mu C\]
• C.                    \[40\mu C\]
• D.                    \[20\mu C\]