An Indifference Curve Is

An indifference curve is

A) the set of all goods that the consumer can afford given her income and the prices of the goods.
B) all combinations of goods (or characteristics) of X and Y that yield the same marginal utility.
C) all combinations of goods (or characteristics) of X and Y that yield the same total utility.
D) the set of all points of consumer equilibrium as the consumer's income changes.