Dielectrics: an Air-Filled Capacitor Stores a Potential Energy of

Dielectrics: An air-filled capacitor stores a potential energy of due to its charge. It is accidentally filled with water in such a way as not to discharge its plates. How much energy does it continue to store after it is filled? (The dielectric constant for water is 78 and for air it is 1.0006.)

A) 0.077 mJ
B) 468 mJ
C) 0.040 mJ
D) 6.00 mJ