I believe A would be the best answer. In the question, it states that Shawn has trouble understanding the ideas. So, rephrasing the ideas in his own words would help.
I hope this helped u!
The triangle trade, also called Western or Atlantic slave trafficking, was a slave trade conducted between Europe, Africa and the Americas between the XVIe and XIX centuries. Its aim was to provide black slaves to colonies of the New World (America), to supply Europe with products from these settlements and to sell in Africa,European and American products. This was, for the European ships, to bring to the Atlantic coasts of Africa different goods of European origin, objects of little value, guns, weapons... highly appreciated by Africans. Goods were exchanged for black African prisoners, who were then forced to go to Americas. Here men, women, children... were sold as slaves to work in the cotton or sugar cane fields.The ships then returned to Europe with American coffee, sugar, cotton, rum which were resold. This trade lasted from the XVIe century until the early XIXe century. They say it was triangular because, on a map, it was represented by arrows connecting Europe, Africa and America which draw a triangle.
She should re-read her poem carefully and see if she has spelling errors..