"A. The ancestor of the dog." is a fragment. When in doubt, say the sentence out loud and ask yourself if there is enough information for the sentence to make sense.
Answer:
The answer is C, congregated.
Explanation:
If you chose A, you are basically saying that they left as they waited for the groom. If you chose B, you basically are saying that you are choosing what you people are and separating in groups. And if you chose D, well, you are basically saying that you were trying to keep people together by giving ideas to them. They want to make them sleep. So the best answer is C, congregated.
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Exempt in fantasy football means players are eligible for the reserved slot.