116. A parallel-plate capacitor is connected to a battery. Without disconnecting the capacitor, a student pulls the capacitor's plates apart so that the plate separation doubles. As a result of this action, what happens to the voltage across the capacitor and the energy stored by the capacitor?
(A) the voltage doubles; the energy stays the same
(B) the voltage doubles; the energy halves
(C) the voltage stays the same; the energy halves
(D) the voltage stays the same; the energy doubles
(A) the voltage doubles; the energy stays the same
(B) the voltage doubles; the energy halves
(C) the voltage stays the same; the energy halves
(D) the voltage stays the same; the energy doubles