Which of the following statements about the optimal solution to the consumer problem based on the Cobb-Douglas utility function is NOT true?

Question

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The optimal solution to the consumer problem based on the Cobb-Douglas utility function does not have a negative marginal utility of income. The marginal utility of income is positive, but diminishing. A negative marginal utility of income would mean that the consumer values an additional unit of income less than the previous unit, which contradicts the assumption of rational behavior. A, B, and C are true statements about the optimal solution to the consumer problem based on the Cobb-Douglas utility function.

Which of the Following Statements About the Optimal Solution to the Consumer