Read the sentence. The team won the majority of the regular season games, so they were optimistic about a victorious post-season. The sentence is compound because it contains

A compound sentence contains two independent clauses joined by a coordinating conjunction. Here, “The team won the majority of the regular season games” and “they were optimistic about a victorious post-season” can each stand alone as a sentence, and “so” connects them. The correct choice is “two independent clauses.”

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