Two Identical Iron Spheres Have Equal Positive Charges and the Force

Two identical iron spheres have equal positive charges and the force between them when they are 1 m apart is 4 N. What percentage of the electrons has been removed from each sphere if each sphere has 1 mole (6 *10²³) of iron atoms? (k_e = 8.99 * 10⁹ N.m²/C², the atomic number of iron is 26, and the electron charge is -1.6 *10 ^{- 19} C)

A) 8 *10 ^{- 10} %
B) 0.000002%
C) 0.001%
D) 4 *10 ^{- 10} %