Marginal Utility Analysis Predicts a Downward-Sloping Demand Curve for Good

Multiple Choice

Marginal utility analysis predicts a downward-sloping demand curve for good X because

A) as P_X falls,the ratio MU_X/P_X becomes smaller,causing the consumer to purchase more of good X.
B) as P_X rises,the consumer increases purchases of X such that MU_X/P_X is equal to MU/P for all other products.
C) utility-maximizing consumers equate marginal utility received for each product consumed.
D) all demand curves are downward sloping,regardless of the behaviour of consumers.
E) as P_X falls,the consumer increases purchases of X until MU_X/P_X is equal to MU/P for all other products.