Why did religious syncretism take place in African societies before 1800?

A.African slaves who converted to Christianity or Islam returned to spread their new religion.

B.Local religions forced Christian and Muslim traders to adopt animism in order to trade with them.

C. Christian and Muslim traders forced African peoples to convert to their religion in order to facilitate a more efficient process of trade.

D. Christian and Muslim traders made their way into Africa, which influenced the local animistic religions and created a blending of religions.