Final answer:
French military and naval assistance was crucial in the American victory in the Revolutionary War, particularly at the Battle of Yorktown and through the leadership figures like the Marquis de Lafayette. The correct answer is option A. and D.
Step-by-step explanation:
The French naval and military assistance were vital to the American victory during the Revolutionary War. After the significant American victory at the Battle of Saratoga, France recognized American independence and began supplying essential military support. This included gunpowder, money, soldiers, and naval forces. The intervention of the French Navy was particularly decisive at the Battle of Yorktown, where they played a crucial role in the defeat of the British forces, effectively ending the conflict in favor of the Americans. Additionally, France provided military leaders such as the Marquis de Lafayette, who served as an aide-de-camp to George Washington and demonstrated solidarity in the American struggle.