Counting each carbon atom separately, how many different carbon atoms of the ion shown carry the positive charge in at least one resonance contributor?

Answer: C

The ion shown is the benzyl cation. Besides the benzylic CH2 carbon, the charge appears on the two ortho carbons and the para carbon, but never on the meta carbons. The total is 1 + 2 + 1 = 4 (checked with RDKit).

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