Which of the following statements about Africans brought as slaves to the British North American colonies is true? (A) They were the primary labor source for plantations in the Chesapeake by 1630.
(B) They had a much lower life expectantly in the Chesapeake than in South Carolina or the West Indies.
(C) They greatly outnumbered Europeans in every colony south of the Mason-Dixon Line by 1776.
(D) They maintained cultural practices brought from Africa.
(E) They were the primary labor source in Pennsylvania until 1720.