How did the french contribute to the outcome of the revolutionary war?

They overall helped the Continental Army in some (or many) battles like the Battle of Saratoga

The second agreement, the Treaty of Alliance, made the fledgling United States and France allies against Great Britain in the Revolutionary War. The French decided to back the U.S. in its military efforts until the U.S. had full independence from Great Britain.

The answer is a)advocates of divine right.