How does the capacitance change with the effect of the dielectric

How does the capacitance change with the effect of the dielectric when the battery is kept disconnected from the capacitor?

A. Increases

B. Decreases

C. Remains constant

D. Zero

I got this question in homework.

Query is from Effect of Dielectric on Capacitance topic in chapter Electrostatic Potential and Capacitance of Physics – Class 12

C = $$\frac {Q_0}{V}$$
C = $$[ \frac {Q_0}{(\frac {V_0}{k})} ]$$
C = $$\frac {kQ_0}{V_0}$$