Two Electrons Are in Close Proximity; the Repulsive Force Between $\mu$

Two electrons are in close proximity; the repulsive force between them is 1.1 $\mu$ N. The distance between the two charges is

A) $3.5 \times 10 ^ { - 11 }$ m.
B) $7.8 \times 10 ^ { - 11 }$ m.
C) $1.4 \times 10 ^ { - 11 }$ m.
D) $5.3 \times 10 ^ { - 11 }$ m.