Historians Have Advanced Several Different Ideas About the Increase in the Slave

Historians have advanced several different ideas about the increase in the slave trade during the seventeenth century. Which of the following factors might explain this increase?

A) More Europeans began using slaves as household servants and as factory labor, doubling the demand for slave labor.
B) Africans stopped resisting European slave traders, making it much easier to capture and transport slaves.
C) Improvements in muskets, the rising price of slaves, and growing conflict between African tribes made slave capture easier and more profitable.
D) European governments instituted an international law legalizing the slave trade, making it much easier for traders to buy and sell slaves.