Concept:Farm power varies in availability, cost, and the number of operations it can support.
In West Africa, the most versatile and practical source is animal power.
Explanation:Animal power relies on draught animals such as oxen, donkeys, and bulls.
These animals can perform many farm operations, including ploughing, ridging, planting, weeding, and transporting produce.
They are readily available and affordable for small-scale farmers across West Africa.
This makes them more adaptable and dependable than other listed sources.
Biogas, wind, and water are less common, less accessible, and cannot easily handle such a wide variety of farm tasks in the region.
Answer:B. Animal