A Downward-Sloping Demand Curve Illustrates the

A downward-sloping demand curve illustrates the

A) relationship between consumers' income and their willingness to purchase the good in question, provided the good is inferior.
B) negative relationship between quantity demanded and quantity supplied.
C) idea that the more of one good that a consumer buys, the less income she has to spend on other goods.
D) law of demand.