The Charge Per Unit Length on an Insulator Is 6

The charge per unit length on an insulator is 6.2 μC/m.On a 2.0-m length of this material,what is the difference in the number of electrons and the number of protons?

A) There are 7.8 × 10¹³ more electrons than protons.
B) There are 7.8 × 10¹³ more protons than electrons.
C) There are 3.9 × 10¹³ more protons than electrons.
D) There are 3.9 × 10¹³ more electrons than protons.