Concept:Trypanotolerant cattle can survive and thrive in tsetse-fly infested areas with little harm from trypanosomiasis.Explanation:The main trypanotolerant breeds are the N'dama and the Muturu cattle.These West African breeds naturally resist the disease causing trypanosomiasis.Option A lists "N'dama and moturu", which correctly names these resistant breeds.The other options list breeds that do not share this natural resistance.Answer:A. N'dama and moturu