The tian shan lies mostly in and northwestern china. a. uzbekistan b. tajikistan c. kyrgyzstan d. kazakhstan

Option C. Kyrgyzstan

Explanation:

The Tian Shan is a great mountain system located in Central Asia. It stretches about 1500 miles from west-southwest to east-northeast.

Although some of the tallest peaks of the Tian Shan reside along the borders of countries such as Kazakhstan, this mountain range has lays its main foundation between the borders of China and Kyrgystan.

the great wall of china worked as a defense for the feudal states of the zhou dynasty to the north. during the warring states period more walls were put up to defend the borders of the different kingdoms. it was semi successful because despite the wall, the mongols eventually conquered china also the great wall provided protection to the economic development and cultural progress, safeguarded the trading routes such as the silk road, and secured transmission of information and transportation. @jayxboof