Answer:
D. He had no heirs to his power which left the empire to fall apart quickly after his death
Step-by-step explanation:
Genghis khan had a lot of heirs from multiple women. In fact, a DNA study showed that around 16 million people living in Asia today might be a descendants of Genghis Khan.
Before his death, he appointed one of his son named Ögedei Khan as his successor. He fulfill his father's wish before he died and continue Mongolian conquest to Europe and East Asia