An Air-Filled Capacitor Carries Enough Charge to Store $6.00 \mathrm {~mJ}$

Multiple Choice

An air-filled capacitor carries enough charge to store $6.00 \mathrm {~mJ}$ of potential energy. It is then 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) $468 \mathrm {~mJ}$
B) $6.00 \mathrm {~mJ}$
C) $0.04 \mathrm {~mJ}$
D) $0.077 \mathrm {~mJ}$