Answer:
A. The outcome of that battle showed that America could defeat Great Britain.
Step-by-step explanation:
Following the defeat of Great Britain during the Battle of Saratoga, which is generally considered as the major turning point in the American Revolution war.
France decided to support the United States mainly because they believed that the outcome of that battle showed that America could defeat Great Britain.
Also, it serves as an opportunity for France to take a revenge on Great Britain following their defeat in French Indian war