The Coulomb's Force Between a Proton and an Electron Is $\times$

Multiple Choice

The Coulomb's force between a proton and an electron is 2.27 $\times$ 10³⁹ times greater than the gravitational force.If the two forces were equal,what should the size of the elementary charge be

A) 1.60 $\times$ 10^-19 C
B) 3.36 $\times$ 10^-39 C
C) 1.23 $\times$ 10^-77 C
D) 2.27 $\times$ 10^-39 C
E) 4.41 $\times$ 10^-40 C