If the marginal product of labour is falling, then the average product of labour Part 2 A. can be rising, falling, or at its maximum; and the marginal cost can be rising, falling or at its minimum. B. can be rising, falling, or at its maximum; but the marginal cost must be falling. C. must be falling; but the marginal cost can be rising, falling, or at its minimum. D. must be falling; but the marginal cost must be rising. E. can be rising comma falling comma or at its maximum; but the marginal cost must be rising