51.  which description of genghis khan is correct

killed in battle while fighting the forces of the song dynasty
constructed the important trade artery called the silk road
united the mongol tribes known as the ruler of all men
first emperor of china began construction of the great wall

Respuesta :

united the mongol tribes known as the ruler of all men?
The answer is C. "United the Mongol tribes, known as the ruler of all men."