The computation shows that first person to get both will be A. the 42nd voter.
It should be noted that from the information given, every 6th voter gets a button and every 7th voter gets a sticker.
Therefore, the first person to get both will be the the lowest common multiple. In this case, the lowest common multiple between 6 and 7 is 42.
Therefore, the correct option is the 42nd voter.
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