Consider the following three Lewis structures. Which one of the following statements best describes the relationship between them?
(a) All three structures i, ii, and iii are resonance structures for the same molecule.
(b) Structures i and ii are two resonance structures for the same molecule, and structure iii is an isomer of the molecule represented by i and ii.
(c) Structures ii and iii are two resonance structures for the same molecule, and structure i is an isomer of the molecule represented by ii and iii.
(d) All three structures i, ii, and iii are isomers.
(e) All three structures i, ii, and iii are neither structures nor isomers.