The correct response is: It boosted American spirits and convinced France to become an ally.
The Battle of Saratoga is considered a major turning point in the American Revolution because it was a significant victory for the American forces, which helped to elevate morale among the colonists. Additionally, the American success at Saratoga convinced France of the viability of the American cause, leading them to formally ally with the colonies and provide military assistance, which was crucial for the eventual success of the Revolutionary War.