A Parallel Plate Capacitor of Area a = 30 Cm² $\kappa$

Multiple Choice

A parallel plate capacitor of area A = 30 cm² and separation d = 5 mm is charged by a battery of 60-V.If the air between the plates is replaced by a dielectric of $\kappa$ = 4 with the battery still connected,then what is the ratio of the initial charge on the plates divided by the final charge on the plates?

A) 4.3
B) 1
C) 16
D) 0.25
E) 4.0