What was the initial issue that created a division for the muslims? which city should serve as their capital who should have leadership how to maintain religious tolerance whether the umayyads should be supported

The correct answer is the second one who should have leadership.

After the death of the Prophet Muhammad, a struggle among Muslims started about who should lead the Umma, which is the community of Muslim believers. A big majority were of the idea that the leadership should be in the hands of the most qualified person of the Umma, while another group thought that the Caliph should be a member of the Prophet's family. The first group also followed a collection of the documented facts and teaching of the Prophet called Sunnah, thus they were called Sunnis. The second group was formed by followers of Ali, the Prophet's nephew, who they thought was the legitimate successor. Therefore they were called Shia, which in Arabic means follower.

The correct answer is the second one who should have leadership.

After the death of the Prophet Muhammad, a struggle among Muslims started about who should lead the Umma, which is the community of Muslim believers. A big majority were of the idea that the leadership should be in the hands of the most qualified person of the Umma, while another group thought that the Caliph should be a member of the Prophet's family. The first group also followed a collection of the documented facts and teaching of the Prophet called Sunnah, thus they were called Sunnis. The second group was formed by followers of Ali, the Prophet's nephew, who they thought was the legitimate successor. Therefore they were called Shia, which in Arabic means follower.

the answer is option a.

they made rome the dominant power in the mediterranean.