When Kathryn Is at Her Consumer Equilibrium,she Is

When Kathryn is at her consumer equilibrium,she is

A) consuming the combination of goods that is at the midpoint of her budget line.
B) consuming a combination of goods that is located inside her budget line.
C) consuming a combination of goods that is located outside her budget line.
D) consuming a combination of goods such that the marginal utility from good X divided by the marginal utility from good Y equals the price of good X divided by the price of good Y.
E) on the midpoint of her demand curve.