In 1781, Admiral De Grasse of the French Navy finally arrived off the Chesapeake. What was the result of this event?

1. The arrival of the French Navy caused General Cornwallis to evacuate Yorktown and march his army south, where he encountered and was defeated by the Kentuckian Rough Riders (a group of militia from the mountains of Kentucky).
2. The arrival of the French Navy resulted in a battle between the British and French fleets. The result is that the British fleet was defeated, allowing the French fleet to attack New York next, which finally ended the war.
3. The arrival of the French Navy resulted in General Cornwallis being surrounded by the American and French army on one side, and the French Navy on the other side. Because he could not flee and had no access to supplies by sea, Cornwallis was forced to surrender and end the war.
4. The result was that the French were defeated (again), and General Cornwallis was able to continue the fight against America for another two years.