After 1680,reliance on Slave Labor in Colonial America Rapidly Increased

After 1680,reliance on slave labor in colonial America rapidly increased because

A) indentured servants in America increasingly demanded better wages.
B) slave codes offered planters an incentive to buy more slaves.
C) the British Royal African company gained a monopoly on the slave trade in colonial America.
D) new laws made it easier and more profitable for Americans to enter the slave trade.
E) planters feared the growing number of landless freemen in the colonies.