In the 670s how was the leadership of islam determined?

The correct answer is :  In the year 670 Mu'awiyah was governor of SIria, ill and his son Yazid, who was the son of his favorite spouse, was named as his successor. In 680 Mu'awiyah dies and many people do not agree with his successor, they consider him someone without mercy and for this he had to face many rebellions. Finally Yazid dies in one of these rebellions. He was succeeded by a sick son who also died shortly after.

doesn't make any since

explanation:

a causal relation between two events exists if the occurrence of the first causes the other. the first event is called the cause and the second event is called the effect. a correlation between two variables does not imply causation.

explanation: