Which two factors contributed to the spread of islam in africa? (btw its two factors not just 1) a) islam was already practiced by people in africa. b) many africans no longer believed in their own religions. c) the islamic empire extended into north africa. d) the gold-salt trade brought islamic arabs into western and southern africa.

C) The Islamic Empire extended into North Africa.

D) The gold-salt trade brought Islamic Arabs into western and southern Africa.

the option which was not a function of missionaries in the northwest was the first one - they established posts for trading furs and other goods.

missionaries were sent around the world to spread religion and their knowledge and others - they were not merchants who sold furs and other goods.