Characterize utility maximization. Part 2 When consumers maximize utility, Part 3 A. they consume each good up to the point where the marginal utility per dollar spent is the same for each good. B. the marginal rate of substitution equals the price of the good on the horizontal axis divided by the price of the good on the vertical axis at the point of optimization. C. the slope of the indifference curve equals the slope of the budget constraint at the point of optimization. D. both a and b. E. all of the above.