Within 70 years, the relative weakness of the Song dynasty allowed the to gain control of China. A)Han Dynasty
B)Buddhist Monks
C)Mongols
D)Qin Dynasty

C. Mongols

Explanation:

After two decades of sporadic warfare, Kublai Khan's armies conquered the Song dynasty in 1279, after the Southern Song suffered military defeat in the Battle of Yamen. The Mongol invasion eventually led to a Chinese reunification under the Yuan dynasty.

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explanation:

social contract theory, nearly as old as philosophy itself, is the view that persons' moral and/or political obligations are dependent upon a contract or agreement among them to form the society in which they liv