Answer:
c. remains the same
Step-by-step explanation:
The capacitance of a capacitor is can be represented as;
C = Q/V
There will be no charge flow from the battery to the capacitor or vice versa if the battery is disconnected.
Due to energy conservation, the energy contained and stored in a capacitor will continue to retain and be the same, since an increase in capacitance reduces the voltage, resulting in the same final energy stored.