[单选题]
A parallel-plate cap2d 2e fveq07h pyhuoy**v)c 6eacitor is construct/u lkil+8ym 2red with plate area of $0.40 \; m^{2}$ and a plate separation of 0.10 mm. How much energy is stored when it is charged to a potential difference of 12 V?
A. $2.5 \; mJ$
B. $5.0 \; mJ$
C. $7.5 \; mJ$
D. $10 \; mJ$
