Two condensers of capacities \[2C\] and C are joined in parallel and charged upto potential V. The battery is removed and the condenser of capacity C is filled completely with a medium of dielectric constant K. The p.d. across the capacitors will now be [IIT 1988]

• A.                    \[\frac{3V}{K+2}\]
• B.                                      \[\frac{3V}{K}\]
• C.                    \[\frac{V}{K+2}\]        
• D.            \[\frac{V}{K}\]