Consider the diagram shown below, which depicts an indifference curve (U1) and budget line (BL) for Josefina, who finds her optimal consumption of goods X and Y at point C: B U1 BL X 2 Which of the following statements is a correct characterization of point C? a) Josefina has spent all of her available income. b) MUx/MUY = Px/Py, where MUx and MUY refer to the marginal utility of X and Y, and Px and PY refer to the price of X and Y. c) Marginal rate of substitution (X for Y) equals Px/PY. d) Marginal rate of substitution (X for Y) is less than at point B. e) All of the above are correct characterizations of point C