Scenario 13-4 If Farmer Brown plants no seeds on his farm, he gets no harvest. If he plants 1 bag of seeds, he gets 5 bushels of wheat. If he plants 2 bags, he gets 9 bushel are his only cost. Refer to Scenario 13-4. Farmer Brown's production function exhibits O a. increasing marginal product. O b. constant marginal product. O c. diminishing marginal product. O d. The production function is unrelated to the marginal product