The Marginal Rate of Substitution Is Defined as

Multiple Choice

The marginal rate of substitution is defined as

A) the amount of good Y substituted for good X by a consumer.
B) the amount of good Y that a consumer is willing to substitute for good X and stay at a given level of satisfaction.
C) the feasible rate of substitution given prices.
D) the slope of the utility function.
E) the convexity of the indifference curve.