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. T<u>he 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.</u>
This case was the real divide that formed the two most important sects of Islam which is the Sunni and the shia.
Answer:
C. Providing artists with discarded materials for their artwork.
Explanation: