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After seeing how unstable the monorail Roy had built was, the townspeople had no doubt that they'd been fooled by a charlatan.
Well, let's start by eliminating the noun "Charleston," which sounds more like a dance or a place on a map than the right answer! "Fraud" is the closest in meaning to "charlatan," a person who pretends to be something he or she is not in order to trick people out of their money. The other answer choices have completely unrelated meanings.
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