Final answer:
The outcome of the Battle of Yorktown was that Cornwallis surrendered, ending the war. Correct option is A.
Step-by-step explanation:
The outcome of the Battle of Yorktown was option A. Cornwallis surrendered, ending the war. In October 1781, the American and French armies laid siege to Cornwallis's army, effectively trapping them on the Yorktown peninsula.
After a siege that lasted eight days, Cornwallis capitulated on October 19, 1781, marking the last major action of the American Revolution and leading to the eventual recognition of American independence.