Which of the following is not true regarding the outcome of a consumer’s optimization process ?

A. The marginal utility per dollar spent on each good is the same
B. The marginal rate of substitution between goods is equal to the ratio of the prices between goods
C. The consumer’s indifference curve is tangent to his budget constraint
D. The consumer has reached his highest indifference curve subject to his budget constraint
E. The consumer is indifferent between any two points on his budget constraint

Suppose we measure the quantity of good X on the horizontal axis and the quantity of good Y on the vertical axis If indifference curves are bowed inward, as we move from having an abundance of good X to having an abundance of good Y, the marginal rate of substitution of good Y for good X (the slope of the indifference curve) ?

A. rises
B. stays the same
C. could rise or fall depending on the relative prices of the two goods.
D. falls