A 60-μF Air-Filled Capacitor Is Connected Across a 100-V Potential Source

A 6.0-μF air-filled capacitor is connected across a 100-V potential source (a battery) .After the battery fully charges the capacitor,it is left connected and the capacitor is immersed in transformer oil,which has a dielectric constant of 4.5.How much additional charge flows from the battery onto the capacitor during this process?

A) 1.2 mC
B) 1.7 mC
C) 2.1 mC
D) 2.5 mC