JEE Main 2019 Physics question

A parallel plate capacitor having capacitance 12 pF is charged by a battery to a potential difference of 10 V between its plates. The charging battery is now disconnected and a porcelain slab of dielectric constant 6.5 is slipped between the plates. The work done by the capacitor on the slab is:

• (A)508 pJCorrect
• (B)692 pJ
• (C)560 pJ
• (D)600 pJ