Answer:
A table of tall, thin, and attractive girls wearing expensive clothes did not let two girls in gym clothes sit down.
(The fact that they are wearing the same type of clothes, expensive clothes, and have the same physique shows that they are an "exclusive" clique)
Explanation:
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.