For the Questions That Follow, Consider the BEST Lewis Structures

Multiple Choice

For the questions that follow, consider the BEST Lewis structures of the following oxyanions:
(i) NO₂^-
(ii) NO₃^-
(iii) SO₃^2-
(iv) SO₄^2-
(v) BrO₃^-
-There can be four equivalent best resonance structures of ________.

A) (i)
B) (ii)
C) (iii)
D) (iv)
E) (v)