It is easy for us to find that Mexico has so many neighbors. The United States is to the north while Guatemala and Belize are to the south. Mexico is about one quarter of the size of the United States with the population of more than ninety million people. The language of Mexico is Spanish, which makes Mexico the world's largest Spanish-speaking country. Mexico City is the capital and largest city of Mexico. The city is also very high. It is 7349 feet high (2240 meters), making it one of the highest capital cities in the world. The population, of Mexico City grows bigger every day. About thirty million people live there. It has more people than any other city in the world, even more than Tokyo. Mexico also has its specialties. Many of the foods we eat started in Mexico such as beans, maize, avocados, tomatoes, peanuts, chili peppers, vanilla, and chocolate. Mexico is also famous for its cactus   plants and has more kinds of cactus than any other country. The best title of the passage is   _  .
Mexico City Mexico's plants Mexico Mexico's population
Question: It is easy for us to find that Mexico has so many neighbors. The United States is to the north while Guatemala and Belize are to the south. Mexico is about one quarter of the size of the United States with the population of more than ninety million people. The language of Mexico is Spanish, which makes Mexico the world's largest Spanish-speaking country. Mexico City is the capital and largest city of Mexico. The city is also very high. It is 7349 feet high (2240 meters), making it one of the highest capital cities in the world. The population, of Mexico City grows bigger every day. About thirty million people live there. It has more people than any other city in the world, even more than Tokyo. Mexico also has its specialties. Many of the foods we eat started in Mexico such as beans, maize, avocados, tomatoes, peanuts, chili peppers, vanilla, and chocolate. Mexico is also famous for its cactus   plants and has more kinds of cactus than any other country. The best title of the passage is   _  .
A. Mexico City
B. Mexico's plants
C. Mexico
D. Mexico's population
Answer: