Concept:A versatile source of farm power is one that can be used for many different farming operations, is affordable, and does not depend on costly technology.
Explanation:In West Africa, animal power is the most adaptable and widely used source of farm power.
Animals such as bulls, oxen, and donkeys are used for clearing land, ploughing, ridging, planting, weeding, and transporting farm produce.
They are also used for milling and other farm tasks.
Wind and water power are unreliable because they depend on weather conditions and location.
Biogas requires expensive equipment and technical skill that are not easily available to small-scale farmers.
Animal power is readily available, renewable, and well suited to the smallholder farms that dominate West African agriculture.
Answer:B. Animal