What was the significance of the battle of saratoga?

a-the british victory at saratoga led congress to restructure its supply chains for the continental army.

b-the american victory at saratoga convinced france to join in alliance with the patriot cause.

c-the continental army used new methods of guerrilla warfare to combat the british army.

d-it proved that training at valley forge had paid off in the continental victory at saratoga.