Concept:Animal power is the most versatile source of farm power in West Africa because it can perform many different agricultural operations.
Explanation:Farm power sources include humans, animals, machines, wind, water, and biogas.
In West Africa, animals such as bullocks, donkeys, and camels are widely used.
Animal power can be used for land clearing, ploughing, ridging, planting, weeding, and transporting farm produce.
It works well on small farms and in areas where tractors are too costly or cannot easily reach.
Animals are available locally, reproduce, and feed on natural vegetation, making them cheaper to maintain.
They also provide manure, which improves soil fertility.
Compared with wind or water, animal power is more reliable because it is not dependent on weather conditions.
Water power is limited to specific locations, and wind power is often too weak and unreliable for farm work.
Biogas is mainly used for cooking and lighting, not as a direct farm power source.
Therefore, among the options, animal power is the most adaptable and commonly used in West African agriculture.
Answer:B. Animal