There are two correct answers. The first one being:
A. Islam played a significant part in government and business in many regions of Africa.
This one is easily verifiable since we can check the amount of countries that use Islam as their official religion or countries that have a significant large muslim population. Islam is very influential in Africa, specially on the north.
C. Christian concepts dominated the educational institutions of many African Kingdoms.
Christianity was also significantly influential in Africa. Specially before Islam dominated the north of the continent.
Christianity is a growing religion in Africa and is more common in the south.
