The correct answer is A. Increased importation of enslaved Africans on the Middle Passage
Step-by-step explanation:
In the triangular trade, Africa, Europe and America traded specific goods with each other forming a triangular trade route. In the case of Africa, this was involved in the trade because it received manufactured goods from Europe such as textiles and in exchange it provided enslaved Africans to Europe. Moreover, slaves were taken to America to grow crops such as tobacco, and the products of these crops were taken to Europe.
In this context, the importation of slaves through the Atlantic Ocean (Middle passage) became necessary to participate in the trade as slaves were essential to producing tobacco, sugar, etc. that were traded in Europe. Also, this increased the number of slaves required as the more slaves the most products and trade. In this context, the triangular trade caused "increased importation of enslaved Africans on the Middle Passage".