Which statement best explains the relationship between the electric force between two charged objects and the distance between them?

a.

as the distance increases by a factor, the electric force increases by the square of that factor.

b.

as the distance increases by a factor, the electric force increases by twice that factor.

c.

as the distance increases by a factor, the electric force decreases by twice that factor.

d.

as the distance increases by a factor, the electric force decreases by the same factor.

e.

as the distance increases by a factor, the electric force decreases by the square of that factor.