Final answer:
The Battle of Saratoga was the turning point in the American Revolutionary War, leading to French support for the Americans and showing that the Continental Army could win a significant battle.
Step-by-step explanation:
The battle that turned the tide of war in favor of the Americans was A. the Battle of Saratoga. This pivotal battle in the American Revolution occurred in 1777 and was crucial because it resulted in a significant morale boost for the American forces and directly led to France entering the war as an ally of the United States. The American victory at Saratoga is often considered a turning point in the war because it demonstrated that the Continental Army could defeat a major British force in a large-scale engagement.