A parallel plate capacitor is connected to a battery as shown in Figure.
(A) Key K is kept closed and the plates of the capacitor are moved apart using insulating handle.
(B) Key K is opened and plates of capacitors are moved apart using insulating handle.
Which of the following statement is correct?

Options

A. the charge on the capacitor increases
B. the voltage across the plates increases
C. the capacitance increases
D. the electrostatic energy stored in the capacitor increases