China was a key influence on East Asian cultures for many centuries as a center of learning, political thought, religion; it provided civilizational models to neighboring kingdoms. In ancient and medieval times, the old elites learned and wrote Chinese characters, used in the administration and for literature in Japan, Korea and Vietnam; Japanese and Korean written language evolved from Chinese caracters. Chinese Confucianism, the official state ideology since the Han dynasty that aims at keeping order, harmony and social hierarchy, was also adopted in courts in East Asia. Buddhism, a religion arrived in China in the 2nd century CE, spread from China to Korea and later to Japan. These are examples of the rich cultural influence China has exerted in Asia historically.
The answer is C, and the reason why is because the climate changed and since they where not used to that, that affected them, also rainfall and flooding started to shrink and that also contributed to the downfall of the Old Kingdom.
The Monroe Doctrine had originally been intended to keep European nations out of Latin America, but the Roosevelt corollary was used as a justification for U.S. intervention in Latin America.
