Concept:Soap-making requires oils and fats, so crops that supply these are useful.Explanation:I. Kolanut is not processed for oil used in soap-making.II. Coconut produces coconut oil, which is widely used in soap production.III. Shea nut yields shea butter, a common fat used in soap-making.Therefore, only coconut and shea nut are the crops useful to the soap-making industry.Answer:C. II and III only