Final answer:
Mexico City is the multifaceted capital of Mexico, known for its historic significance, large population, and significant role in both national and international business, making it 'all of the above'.
Step-by-step explanation:
Mexico City: A Multifaceted Metropolis
Mexico City is the capital of Mexico and serves as the political, cultural, and financial center of the country. With historical roots dating back to the Aztec civilization and Tenochtitlán, the city has always been a significant habitation area. Today, it is one of the largest cities in the world and stands as the urban core of Mexico. The city's official population in 2010 was around 18 million, with estimates including surrounding slums reaching a possible 30 million. This makes it not only the capital of Mexico but also the largest city in North America in terms of population. Additionally, Mexico City operates as a business capital, with its economic reforms and position in NAFTA signifying its role in the global economy.
Considering its prominence, Mexico City is all of the above: A) the capital of Mexico, B) the business capital of Mexico, and C) the largest city in North America.