Two Large, Flat, Horizontally Oriented Plates Are Parallel to Each

Two large, flat, horizontally oriented plates are parallel to each other, a distance d apart. Half-way between the two plates the electric field field has a magnitude E. If the separation of the plates is reduced to d/2 what is the magnitude of the electric field half-way between the plates?

A) 4E
B) E/2
C) 0
D) 2E
E) E