16. Three parallel infinite sheets with charged densities are 2σ, -2σ and σ C/m² respectively and separate 2d and d, as shown in fig. 2. These sheets divide the space into four parts, I, II, III, and IV. Which two regions have the same electric filed.
(A) I and II,
(B) II and III,
(C) II and IV,
(D) I and III.

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