Answer:
D.Kublai Khan's empire
Step-by-step explanation:
During the rule of Kublai Khan The empire was separated, creating four khanates, each governed by a khan and supervised by the great khan. The Golden Horde ruled Russia; Ilkhanate ruled the Middle East, the Khanate of Chagatai ruled the center of Asia and the Great Khanate ruled Mongolia and the whole of China. The empire reached its maximum extension with the conquest of Kublai of the Song dynasty in 1279.