Which of these was cultivated in Africa as a result of the Columbian Exchange?

Question

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Maize, also known as corn, is a crop that originated in the Americas but was introduced to Africa through the Columbian Exchange. It quickly became a popular and important food crop in many African countries. Wheat and barley, on the other hand, were already cultivated in Africa before the Columbian Exchange, and yams are native to Africa and were not introduced through this exchange.

Which of These Was Cultivated in Africa as a Result