The answer to this would be...
C, A table of tall thin and attractive girls wearing expensive clothes did not let dressed in gym clothes sit down.
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A clique is a small group of people, with shared interests or other features in common, who spend time together and do not readily allow others to join them. That alone means that A and B are completely incorrect. D would be the answer... if it wasn't a whole class, A clique is a small group of people, a class is too big. Leaving C to be the answer.