The correct answer is A. Since the 7th century.
Step-by-step 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.