Answer:
Correct answer is C.
Explanation:
C is the correct answer because Abbasid Caliphate was established after the death of Mohammed in the 7th Century, while all other events happened before.
A is not correct as it is connected to first civilizations, so it cannot fit the timeline.
B is also not correct as Roman Empire and Sassanid Empire fought centuries before the foundation of Islam.
The same goes with D as Alexander lived in the 4th Century BC.
