Concept: Oil crops are cultivated mainly for extracting edible or industrial oil, while legumes are grown for their protein-rich seeds.Explanation: Coconut and beniseed are major oil-producing crops.Melon seeds are also processed into oil, so melon is an oil crop.Cowpea belongs to the legume family and is grown as a pulse for human consumption.Therefore, cowpea is not an oil crop.Answer: D. cowpea