islam was introduced into west africa by\n○ missionaries.\n○ prophets.\n○ traders.\n○ nomads.

Brief Explanations:

Islam spread to West Africa mainly through trade - routes. Traders from North Africa and the Middle - East who engaged in long - distance trade in West Africa brought Islam with them. Missionaries were not the main agents of early Islamic spread in West Africa. Prophets are figures from the early days of Islam and not the ones who introduced it to West Africa. Nomads were not the primary group responsible for the introduction of Islam in West Africa.

Answer:

C. traders