The correct answers to this question are A) The Arab Empire unified feuding tribes by controlling the trans-Saharan salt trade and B) the Arab empire unified feuding tribes under the religion of Islam.
The statements that best describe how the Arab empire unified regions of North Africa and the Middle East are: "the Arab Empire unified feuding tribes by controlling the trans-Saharan salt trade and the Arab empire unified feuding tribes under the religion of Islam."
One of the smartest things Arabs did during the spread of its empire was to integrate the new territories under the same religious principles. Arabs used Islan as a way to unify people into the new empire and that way they could best control regions in the Middle East and North Africa. Using the teachings of prophet Muhammad, the Arabs did with religion, what other empires did violence. They also used the relationships build while trading to spread Muslim ideas and beliefs.