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) ?

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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