Final answer:
Rum was the item exchanged in Africa as part of the triangular trade and was made using a by-product of the labor of enslaved people.
Step-by-step explanation:
The item that was exchanged in Africa as part of the triangular trade and was made using a by-product of the labor of enslaved people was rum.
During the triangular trade, English slave traders exchanged rum for captives in African ports. The captives were then transported across the Atlantic and sold to plantation owners in the Caribbean colonies who set them to work growing sugar cane. The molasses, a by-product of sugar production, was then shipped to other English colonies, particularly Massachusetts, where it was transformed into rum and shipped back to England.