Three infinite long charged sheets of charge densities -σ,-2 σ and σ are placed parallel to x y-p...

Three infinite long charged sheets of charge densities -σ,-2 σ and σ are placed parallel to x y-plane at z=0, z=a, z=3 a. Electric field at pointis given as :
Figure 1.372
(A) -2 σ/ϵ_0k̂
(B) 2 σ/ϵ_0k̂
(C) -4 σ/ϵ_0k̂
(D) 4 σ/ϵ_0k̂

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