Concept:Subsistence farming is food production meant mainly for the farmer's family, not for commercial sale.Explanation:Rotational bush farming and permanent cultivation are traditional small-scale methods used in West Africa.Mixed farming also fits subsistence because it combines crops and livestock for household needs.Plantation agriculture, however, involves growing a single cash crop on a very large area for market sale.Therefore, plantation agriculture is not a form of subsistence farming.Answer:C. plantation agriculture