Before 1492, modern-day Mexico, most of Central America, and the southwestern United States comprised an area now known as Meso or Middle America.
Explanation:
Five hundred years before Columbus, a daring band of Vikings led by Leif Eriksson set foot in North America and established a settlement. And long before that, some scholars say, the Americas seem to have been visited by seafaring travelers from China, and possibly by visitors from Africa and even Ice Age Europe.
So B is definitely not correct. A is not super important. Gotta wither be C or D but it is probably C because that is why they did revisions to the AoC because they needed a new system.