2. The concept of diminishing marginal rate of substitution indicates that (A) as the consumption of good X increases, individuals are willing to give up an increasing amount of good Y in order to obtain one more unit of good X. (B) along an indifference curve, a consumer prefers the consumption combinations moving to the northwest along the curve. (C) as the consumption of good X increases, individuals are willing to give up a decreasing amount of good Y in order to obtain one more unit of good X. (D) None of the above answers is correct.