Final answer:
The fall of Montreal marked the end of French colonial goals in North America, as it signified the loss of French military presence and territorial claims in the region.
Step-by-step explanation:
The event that marked the goal of the French in North America was A. The fall of Montreal. While Quebec was an important target for the British and American forces during various conflicts, including the French and Indian War and the American Revolutionary War, it was the fall of Montreal in 1760 that essentially marked the end of French colonial ambitions in the region. The capitulation of Montreal to British forces during the French and Indian War led to the cessation of the French military presence and their claimed territories in North America, outside of a few small islands.