A Parallel Plate Capacitor with Circular Plates Having Radius 0 $\times$

A parallel plate capacitor with circular plates having radius 0.07 m is used to store energy.If it is desired to store 12 $\times$ 10^-6 J in this capacitor,what must the separation distance be for a voltage of 1.5 kV?

A) 0.64 cm
B) 0.41 cm
C) 2.5 cm
D) 1.3 cm