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 flux through each end of the cylinder?

A) zero
B) 1.3 kN · m²/C
C) 0.25 kN · m²/C
D) 13 N · m²/C
E) 0.13 MN · m²/C