Two point charges are on the x $-$axis. One charge, $q_1=10\mathrm{.}0nC,$ is located at the origin, and the other charge, $q_2=18\mathrm{.}0nC,$ is located at $x=9\mathrm{.}00m.$ What is the force on $q_2?$

A $,20\mathrm{.}0nN$ in the positive x $-$direction

B $,20\mathrm{.}0pN$ in the positive x $-$direction

C $,20\mathrm{.}0nN$ in the negative x $-$direction

D $,20\mathrm{.}0pN$ in the negative x $-$direction

E $,180nN$ in the positive x $-$direction