Two Small, Identical, Neutral Iron Spheres Each Have a Mass

Two small, identical, neutral iron spheres each have a mass of 20.0 g. A quantity of 5.0 *10¹⁰ electrons are transferred from one sphere to the other so that the attractive electrostatic force between the spheres becomes equal to the weight of one sphere. The separation between the spheres is

A) 2.3* 10²¹ m.
B) 1.1 * 10²¹ m.
C) 1.7 * 10^-3 m.
D) 1.1 * 10¹⁶ m.
E) 2.3 *10¹⁶ m.