when ___ the african slave trade greatly increased.

when ___ the african slave trade greatly increased.a)AFRICANS BEGAN TO SHIP slaves to europeB)europeans needed more workers in the americasC)isalmic traders replaced europeans traders in western africaD)africans took arabs across the sahara.my choose is bthe earliset europeans to come to africaA)were the ducthB)landed a few times but did not consider the continent valuablec)were the spanishD)traded for several centuries before establishing clolniesmy choose is d