Why Was the Battle of Saratoga a Turning Point in the American

Why was the battle of Saratoga a turning point in the American Revolution?

A) It convinced France to recognize the United States and provide aid needed to win the war.
B) It convinced the British that the war could not be won and persuaded them to seek peace.
C) It marked the failure of the American effort to take control of Canada.
D) It confirmed Washington's authority and power as commander-in-chief of the army.
E) It prompted the Second Continental Congress to declare American independence.