Each 20-M Length of a Long Cylinder (Radius = 4

Each 2.0-m length of a long cylinder (radius = 4.0 mm) has a charge of 4.0 nC distributed uniformly throughout its volume. What is the magnitude of the electric field at a point 5.0 mm from the axis of the cylinder?

A) 9.9 kN/C
B) 8.1 kN/C
C) 9.0 kN/C
D) 7.2 kN/C
E) 18 kN/C