The Line That Relates the Price of a Good to the Quantity

The line that relates the price of a good to the quantity demanded of that good is called the

A) demand schedule, and it slopes upward only if the good for which the line is drawn fails to conform to the law of demand.
B) demand schedule, and it slopes upward only if the demand for the good in question, relative to the demand for other goods, is increasing over time.
C) demand curve, and it slopes upward only if there is a positive relationship between income and quantity demanded.
D) demand curve, and it slopes downward as long as the good in question conforms to the law of demand.