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JGWeissman comments on Arrow's Theorem is a Lie - Less Wrong
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That's not what independence of irrelevant alternatives means; it means that, given the same relative ranking between A and B, the voting algorithm will always make the same decision, with or without the alternative. It doesn't mean that the voters will make the same decisions.
Why do you expect the voting algorithm to make the same decision when the voters make different decisions? If the addition of Option C causes supporters of Option A over Option B to decrease the difference in their scores between A and B more than the supporters of Option B over Option A, it can shift the algorithms output from Option A to Option B.