Final answer:
The French decision to support the American cause at Saratoga led to substantial debt, which contributed to the financial crisis that precipitated the French Revolution.
Step-by-step explanation:
The American victory at the Battle of Saratoga was a crucial turning point in the Revolutionary War and had significant consequences for France. The French decision to support the American cause with military and financial assistance eventually led to substantial debt. Consequently, the fiscal strain contributed to the financial crisis that precipitated the French Revolution and the fall of the old regime.
It is option B that correctly identifies the connection between French support for the American cause and the impact on the French Revolution. The French efforts to support the American Revolution, including financial and military aid, caused a significant escalation in national debt, which was a contributing factor to the economic difficulties that led to political unrest and eventually the French Revolution.