The correct answer is B. The "Middle Passage" referred to the transportation of slaves from Africa to the New World.
The Middle Passage was the stage of triangular trade in which millions of Africans were sent to the New World as part of the slave trade in the Atlantic. The ships left Europe for African markets with manufactured products, which were marketed by Africans bought or kidnapped, who were transported through the Atlantic slave trade; the slaves were sold or exchanged for raw materials, which would be transported back to Europe to complete the trip. The trips in the Middle Passage were made by large financial companies, usually organized by companies or groups of investors instead of individuals.
