Islam and the Arabic language were brought to West Africa by...

Explanation:

What is meant by West Africa is the wide area that extends from the Atlantic Ocean in the west to Sudan and the Nile Valley in the east, which lies between desert or semi-desert areas in the north and the range of tropical forests in the south. To West Africa and extend its influence there, especially the tribes of Bani Hilal and Bani Salim, which prompted the local tribes of the Berbers to move south after their conversion to Islam.

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the answer is a. conquest of the western frontier. hope this and good luck on your assignment!