Suppose Marge spends her entire income on two "good" goods, X and Y, and has "standard- looking" indifference curves. Which statement characterizes Marge's optimal consumption bundle? She consumes positive amounts of both X and Y. Her indifference curve is tangent to her budget line. O Her marginal rate of substitution between X and Y equals the ratio of prices for X and Y. She reaches the highest utility level that is attainable, given her budget constraint. O Each of the preceding statements characterizes Marge's optimum