Calculate the electric force between two electrons that are 5.3 x 10-11 m apart (electron charge = -1.6 x 10-19 C).

a. 2.6 x 10-6 N
b. 8.5 x 10-10 N
c. 4.5 x 10-9 N
d. 3.5 x 10-12 N