One of the Reasons the Slave Trade Was So Successful

One of the reasons the slave trade was so successful for Europeans in general was that

A) sugar plantations off the coast of Africa provided a ready market for slaves.
B) the increased wealth of European people provided a lucrative market for domestic help that was fulfilled by African slaves.
C) the Catholic Church was not supportive of slavery, thereby increasing its appeal among non-Christian nations.
D) Europeans had a natural immunity to West African diseases thereby allowing them internal access to slaves.