The Figure Below Shows Four Parallel Plate Capacitors: A, B

The figure below shows four parallel plate capacitors: A, B, C, and D. Each capacitor carries the same charge q and has the same plate area A. As suggested by the figure, the plates of capacitors A and C are separated by a distance d while those of B and D are separated by a distance 2d. Capacitors A and B are maintained in vacuum while capacitors C and D contain dielectrics with constant  = 5.
-Which capacitor is storing the greatest amount of electric potential energy?

A) A
B) B
C) C
D) D
E) Since all four carry the same charge, each will store the same amount of energy.