Answer:Believing that God had chosen him as his messenger Muhammad began to preach what God had revealed to him. The simple and clear-cut message of Islam, that there is no God but Allah, and that life should be lived in complete submission to the will of Allah, was attractive to many people, and they flocked to hear it.
Explanation:
They had weapons, their societies were separated, which made it easier for them to take over
I'm pretty sure it would be B, because the tensions between most groups are mainly to do with religious differences, especially relating to the belief of how many gods exist.
