Concept:Trypanosomiasis is a cattle disease spread by the tsetse fly, which is common in the forest belt of West Africa.Explanation:The tsetse fly thrives in humid, forested areas and transmits the parasite that causes trypanosomiasis.Therefore, cattle kept in the West African forest belt are most likely to suffer from this disease.Other options like foot and mouth, anthrax, and tuberculosis are not particularly linked to this forest belt region.Answer:B. trypanosomiasis