Slave Labor in the Chesapeake Region Increasingly Supplanted Indentured Servitude

Slave labor in the Chesapeake region increasingly supplanted indentured servitude during the last two decades of the seventeenth century,in part because:

A) the opening of the new colony of North Carolina attracted enough whites to make up for the loss of those who would have come to the New World as indentured servants.
B) Bacon's Rebellion reminded leaders of the dangers of allowing racial intermarriage.
C) improving conditions in England reduced the number of transatlantic migrants.
D) a monopoly on the slave trade made it easier to import Africans.
E) indentured servants began forming associations that went on strike for better conditions.