The correct answer is A. Since the 7th century.
Explanation
The expansion of Islam in Africa began in 622 when Muhammad (the founder and first prophet of Islam) organized in Medina a group of servants with the aim of unifying the entire Arabian peninsula. After the death of Muhammad in 632, Islam had spread rapidly for about a century, occupying all of North Africa, Iran, the southern part of Central Asia due to the weakness of the Byzantine Empire. So, the correct answer is A. Since the 7th century.
