Which of the Following Statements Concerning the Shape of the Commerce

Which of the following statements concerning the shape of the commerce in African slaves is most accurate?

A) The emergence of the Atlantic slave trade caused the immediate end of the older trans-Saharan slave trade in the hands of the Muslims.
B) The Atlantic trade drew its slaves almost exclusively from southern Africa until the 19th century.
C) The African states of the interior actively resisted the slave trade.
D) The Atlantic slave trade drew slaves from across the African continent and its concentration shifted from Senegambia to central and western Africa over time.