An Infinite Plane of Surface Charge Density σ = +8

An infinite plane of surface charge density σ = +8.00 nC/m² lies in the yz plane at the origin, and a second infinite plane of surface charge density σ = -8.00 nC/m² lies in a plane parallel to the yz plane at x = 4.00 m. The electric field at x = 3.50 m is approximately

A) 226 N/C.
B) 339 N/C.
C) 904 N/C.
D) 452 N/C.
E) zero.