The Relationship Between Slave-Trading and the General Development of Trade

The relationship between slave-trading and the general development of trade within Africa was

A) the slave trade inevitably detracted from the development of other forms of trade.
B) unknown to present historians,though the slave trade detracted from economic development overall.
C) the slave trade inevitably stimulated the development of other forms of trade.
D) the population increases that resulted from the slave trade probably stimulated trade.