What Was the Origin of the Split Between the Sunnis

Multiple Choice

What was the origin of the split between the Sunnis and the Shi'as?

A) Disagreement about the chapters of the Qur'an
B) Disagreement about what kind of clothing women should wear
C) Difference in opinion over who should lead the Muslim community following Muhammad's death
D) Difference of opinion about where the early Muslim community should make its home