Select the correct statement regarding the slave trade.

a. the middle passage was the leg of the triangular trade in which african slaves were transported from africa to the americas.

b. african slaves were marched from the interior of africa to the dungeons located along the coast

c. african slaves were confined to tight quarters in the slave ships were they were forced to lay in feces and urine for the entire 2 to 4 months journey to the americas

d. all of the above