Which statement offers the BEST explanation of the role that geography played in the Battle of Yorktown during the American Revolution?

The Battle of Yorktown in 1781 marked the complete defeat of the British army in the American Revolution. The fact that Cornwallis placed his troops in a position with no route of escape was a major strategic blunder. Thus, the statement that because the British fortifications bordered the York River, it made it easy for the American and French forces to surround Cornwallis' army and secure victory is the best answer.