An Electric Field Is = (400 N/C) for X

An electric field is = (400 N/C) for x > 0 and = (-400 N/C) for x < 0.A cylinder of length 30 cm and radius 10 cm has its center at the origin and its axis along the x axis such that one end is at x = +15 cm and the other is at x = -15 cm.What is the net charge inside the cylinder?

A) zero
B) 22 nC
C) 0.22 nC
D) 4.5 nC
E) 2.2 µC