Why Did Joan of Arc, an Unknown Peasant Girl, Succeed

Why did Joan of Arc, an unknown peasant girl, succeed in helping the French to turn the tide against the English in the Hundred Years' War?

A) She inspired French soldiers to rally round the dauphin.
B) She single-handedly defeated an English army at the battle of Orléans and personally crowned Philip VI as king.
C) She convinced the Burgundians to switch sides from the English to the French in 1435.
D) Because of her religious visions, she drew the support of Pope Martin V, who took the side of the French.