When defining regions, geographers avoid using subjective information.
Because of the vast area of China that is covered with mountains that make it hard to inhabit said areas.
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Tenochtitilan was the capital of the Aztec Empire, and the settlers built the modern city on the ground of this ancient capital. The settlers were the Spanish and the modern capital is Mexico City - this is the correct answer.
The modern city is also place to some ancient Aztec buildings such as Templo Mayor
China is the East Asian country that formed a communist government and broke with non-communist Taiwan in the post World War II era. The correct option among all the options that are given in the question is the third option or option "C". I hope that this answer comes to your help.