In electromagnetism, charge density is a measure of electric charge is the amount of electric charge per unit length, surface area, or volume, called the linear, surface, or volume charge density, respectively. The respective SI units are C⋅m, C⋅m or C⋅m.
Charge density is measured in C⋅m
This is actually false. Reading the prompt it says charge density is charger per unit length which would be coulomb's/meters