Scenario 13-4 If Farmer Brown Plants No Seeds on His Farm, He

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 bushels. If he plants 3 bags, he gets 12 bushels. A bag of seeds costs $120, and seeds are his only cost.
-Refer to Scenario 13-4. Farmer Brown's production function exhibits

A) increasing marginal product.
B) constant marginal product.
C) diminishing marginal product.
D) The production function is unrelated to the marginal product.