What areas were involved in Triangular Trade? Africa, the West Indies, and Europe
Africa, the British colonies in North America, and England
North America, Africa, and Costa Rica
The British colonies, the West Indies, and Canada

The triangle, involving three continents, was complete. European capital, African labour and American land and resources combined to supply a European market. The colonists in the Americas also made direct slaving voyages to Africa, which did not follow the triangular route. So the answer would be the 3rd one.

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