What caused islam to split into sunni and shia branches? a- the question of how to spread the islamic faith b- the question of who should lead muslims c-the question of muhammad's role as prophet d- the question of whose teachings are in the qur'an
B- the question of who should lead muslims.The Sunni–Shia split lies in the schism that occurred when the Islamic prophet Muhammad died in the year 632, leading to a dispute over succession to Muhammad as a caliph of the Islamic community.
