Answer:
The correct answer is B. Northern Africa
Step-by-step explanation:
Northern Africa is a historical region that comprises the northern part of the African continent, separated from the rest of Africa by the Sahara Desert to the south. Northern Africa has one of the highest percentage of Muslims in its population. It is estimated that from a population of approximately 200 million North Africans, 97% are Muslims, (188 million). In contrast, only 7% of Western Europeans are Muslims, while they're a very small minority in Australia (2.6%) and South America (1%).
The reasons for such a high concentration of Muslims in Northern Africa are mainly historical, geographical and cultural. The Arabian Peninsula was the birthplace of Islam, and from there, it expanded all along the Arab cultural sphere, especially with the Umayyad conquest of Northern Africa in the late 8th century.