All of the following are true statements about africa during the middle ages except which one
a. islam had been introduced to ghana by the 10th century
b. the portuguese first sailed to west africa in the 14th century
c. there were no great empires in africa prior to european contact
d. the slave trade emerged as the dominant form of commerce around the gulf of guinea in the 15th and the 16th centuries

All of the following are true statements about Africa during the Middle Ages EXCEPT which one
A. Islam had been introduced to Ghana by the 10th century
B. The Portuguese first sailed to west Africa in the 14th century
C. There were no great empires in Africa prior to European contact
D. The slave trade emerged as the dominant form of commerce around the Gulf of Guinea in the 15th and the 16th centuries

C. There were no great empires in Africa prior to European contact