Concept:Demand for a product is primarily driven by its own market price, as per basic economic theory.
Explanation:Consumers decide how much cowpea to buy based mainly on its price.
When the price rises, buyers purchase less cowpea.
When the price falls, buyers purchase more cowpea.
Income and taste do affect demand, but price remains the strongest and most immediate factor.
Supply influences availability, not the level of consumer demand directly.
Therefore, for cowpea, price is the most important determinant in consumers' buying decisions.
Answer:B. price of cowpea