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 one dependent clause. one independent clause. two dependent clauses. two independent clauses.

Based on the given sentence above, I can say that it is a compound sentence. What makes this sentence compound is that, it consists of two independent clauses and are connected by a coordinating conjunction "so". Therefore, the answer for this would be the last option: two independent clauses.