Which sentence contains two independent clauses and a dependent clause?

A- after battling it for several days, John remained at home because he had a sore throat.

B- here is the money I owe you, and now I am happy to be free of debt.

C- Fred had become very serious about his goals, and he was no longer consistently a practical joker.

D- since we had gone only a mile from camp, we could return before dark and we would not become lost.