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.
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D
“Francis Sumner, PhD, is referred to as the “Father of Black Psychology” because he was the first African American to receive a PhD degree in psychology. Sumner was born in Arkansas in 1895.”
I'm not for sure I understand the question.
