The is known for being one of the world's most
populated areas.

A. North China Plain
B. Plateau of Tibet
C. Da Hinggan
D. Northeast Plain

North China Plain is one of the most populated areas in the world.

Explanation:

China is the most populous country in the world with over 1.3 billion people. The population is not distributed equally across the country though, but there is a very high disproportion in the population density from one part of the country to another. The eastern and southeastern part of China is where the majority of the population leaves and the population density is very high, while Tibet, Xinjiang, and Inner Mongolia have a very small population and low population density.

In the eastern part of China, we have the region known as the North China Plain. This is a region where hundreds of millions of people live, and the reason is mainly that the conditions are the best if we look at it traditionally, while nowadays it is the economic center of the country and there are a lot of opportunities there so naturally even more people have moved in. Some of the cities with the highest population in the North China Plain are the capital Beijing, Qingdao, Zhengzhou, and Tianjin.