How would you synthesize the concepts of demand and quantity demanded to explain their differences?

• A. Demand and quantity demanded are interchangeable terms
• B. Demand is the price, quantity demanded is the quantity
• C. Demand is a specific point at a given price, quantity demanded is the curve showing all price-quantity combinations
• D. Demand is the curve showing all price-quantity combinations, quantity demanded is a specific point at a given price

Answer: (D)