Which sentence uses a comma and a coordinating conjunction correctly to
 separate two independent clauses?
 A. My brother is coming to the amusement park and, he said he'll ride
 the roller coaster.
 B. I've always enjoyed camping, but I don't get to go very often.
 C. Without a doubt, that was the best party I've ever been to.
 D. We'll have to keep the ball moving, play solid defense, and avoid
 costly penalties.
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