Answer:
The correct answer is:
D. The colonial victory convinced France to support American independence
Step-by-step explanation:
A is wrong because the colonist defeated British army in this battle.
B is wrong because the Natives were fighting on both sides during the war and it that sense this battle hasn't changed much.
C is wrong because Britain and France were fierce enemies from the previous war that ended in 1763. and normally France didn't signed any alliance with Britain.
D is correct because the great victory against Burgoyne (who led British army) was a sign for France to enter the war. Colonists have already sent three agents to sign the contract with France and to convince them to enter the war. One of them was Benjamin Franklin.