Which statement best analyzes the effect of leadership on the collapse of the Mongol Empire?

Question

Leaders such as Kublai Khan were assassinated by rival Mongol leaders, leaving the khanates open to invasion.
Disputes over leadership led to the fragmentation of the Mongol Empire into smaller khanates.
Disputes over leadership were resolved by giving Genghis Khan control over the entire Mongol Empire
Leaders such as Timur failed to respond to the bubonic plague, leading to widespread death within the khanates.

Answer 1

The best statement that analyzes the effect of leadership on the collapse of the Mongol Empire is: Disputes over leadership led to the fragmentation of the Mongol Empire into smaller khanates.