Over which main point did Sunnis and Shias disagree?
A. the role of women in Muslim society
B. what should be included in the Sharia
C. who should be Muhammad's successor
D. the role of religion in government

C. who should be Muhammad's successor

Explanation:

The two sects disagree over who should be the Khalifa and by extension the ruler of the caliphate after the death of prophet Muhammad. The Sunnis were the ones that lobbied for the four consecutive Khalifas starting with Abu Bakr while the Shias firmly advocated for Ali ibn e Talib.

This case was the real divide that formed the two most important sects of Islam which is the Sunni and the shia.

if you are on the computer you can not take a picture but you can upload one but i am not sure about phones but i'm pretty sure it's the but to upload one just click the paper clip looking thing/ link thingy thing and upload a pic

well this isn't a question but if you are asking if it is true or false it is, true.