Answer:
B. Northern Africa
Explanation:
Northern Africa is one of the several regions in the world that is dominated by Muslim populations. Almost entirely, the region is composed of people that are following the Islam, with the other religions being almost not represented. Historically, the region had multiple other religions, such as Christianity, Judaism, and local religions, but the over time, the Muslims have suppressed the other religions, forcing the people to convert tot heir religion. Lot of people that followed other religions migrated out of the region, and that is easily noticeable by the rapidly shrinking numbers of followers of other religions. The type of Islam that is dominant in Northern Africa is the Sunni Islam.
I'd say they developed in river valleys (2).
Explanation:
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