The Marginal Rate of Substitution Is Defined as

Multiple Choice

The marginal rate of substitution is defined as

A) the feasible rate of substitution given prices.
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 slope of the utility function.
D) the convexity of the indifference curve.
E) the amount of good Y substituted for good X by a consumer.