The split into sunni and shia divisions of islam can be traced to

The Answer is a dispute over the question of Muhammad's successor.

Explanation:

The split into Sunni and Shi’a divisions of Islam can be traced to a dispute over the question of Muhammad’s successor, particularly since he left no direct male heir. Some believed his successor should be the strongest and wisest in the community, while others believed his son-in-law, Ali, was the rightful heir. These groups became known as Sunni and Shi’a, respectively.

the correct answer is b