which statement best analyzes the effect of leadership on the collapse of the mongol empire?

a ) disputes over leadershipled to the fragmentation of the mongol empire into smaller and khanates.
b ) disputes over leadership were resolved by giving genghis khan control over the empire mongol empire.
c ) leaders such as timur failed to respond to the bubonic plague, leading to widespread death within the khanates.
d ) leaders such as kublau khan were assasinated by rival mongol leaders, leaving the khanates open to invasion.