Which best explains how the Mongols under Genghis Khan were able to establish and maintain a large empire?

Responses

they used diplomats to convince neighboring nations to become allies with them
they used diplomats to convince neighboring nations to become allies with them

they invented the cannon and the catapult, which allowed them to lay siege to enemy cities
they invented the cannon and the catapult, which allowed them to lay siege to enemy cities

they were skilled horsemen who adopted new military technologies and used terror as a weapon
they were skilled horsemen who adopted new military technologies and used terror as a weapon

they created huge armies that used chariots and then divided conquered territories into provinces

they created huge armies that used chariots and then divided conquered territories into provinces