Question

What was the major cause of the first civil war in early Islamic society?

A
Husayn ibn Ali was assassinated.

B
Abu Bakr attacked the Sasanian Empire.

C
Ali ibn Abi Talib became caliph.

D
The Umayyad Caliphate was founded.

Answer 1

I think it's C but I'm not for sure

Answer 2

The First Fitna was a civil war in the early Islamic State caused by the murder of Caliph Uthman ibn Affan in 656 by Egyptian rebels