The correct answer is A) by a treaty with France after victory in the war.
Canada was obtained by Britain by a treaty with France after victory in the war.
The Treaty of Paris in 1763, officially represented the end of the armed hostilities of the "Seven Years War." This war had been fought since 1756, and the British won the war when destroying the fleet of France and took invaded its colonies in the North American territory. The treaty was signed on February 10, 1763, in Paris, France, by Great Britain, Spain, and France. That is how Britain gained the Canadian Territories of Quebec in Canada, and the east bank of the Mississippi River and the Great Lakes Basin in the 13 colonies. From Spain, Britain received the Florida territory.