The Defeat of General Cornwallis and His Army at Yorktown

The defeat of General Cornwallis and his army at Yorktown in 1781, leading to British abandonment of the Revolutionary War, was achieved by

A) American colonial army and naval forces alone.
B) a combined American and French army.
C) a combined force of American, French, Spanish, and Dutch forces.
D) the Virginia Minutemen.
E) a combined American and French army supported by a heavily armed French fleet.