Determine the appropriate resonance from the conjugate base

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The anwer and explanation to this question is shown to the right of the attached image. I have no problem with the explanations of why choices A, B, and D cannot be the answer.
However I think there may be a typo in the third paragraph and that maybe choice C should be the answer instead of choice E, which has a carbon with 5 bonds, but no plus charge on it. Any advice?