The Potential Energy of A $3.5 \mathrm{pC}$ Charge Separated By $6.2 \mathrm{~cm}$

The potential energy of a $3.5 \mathrm{pC}$ charge separated by $6.2 \mathrm{~cm}$ from a $1.6 \mu \mathrm{C}$ charge is

A) $1.2 \times 10^{-5} \mathrm{~J}$ .
B) $8.1 \times 10^{-5} \mathrm{~J}$ .
C) $8.1 \times 10^{-7} \mathrm{~J}$ .
D) $1.0 \times 10^{-5} \mathrm{~J}$ .
E) $1.3 \times 10^{-7} \mathrm{~J}$ .