Who was Baron Friedrich von Steuben


A. a former Prussian captain who turned a disorderly group of American recruits into skilled soldiers


B.the Hessian commander of British troops in the South who lost the battle at Yorktown

C. the Frenchman who became a general on Washington's staff and his lifelong friend

D.a young German officer on Washington's staff who captured a British fort during the battle at Yorktown