Using the concept of marginal rate of substitution, explain why the two sets of curves are different from each other. the indifference curves are different because a. smith's and jones's preferences violate the assumption of transitivity. b. jones's marginal rate of substitution is larger than smith's. c. jones is willing to give up fewer rock concerts for an additional hockey game than smith is. d. smith is willing to give up more rock concerts for an additional hockey game than jones is. e. jones's budget line is flatter than smith's.