Let L represent the number of workers hired by a firm, and let Q represent that firm’s quantity of output. Assume two points on the firm’s production function are (L=6,Q=147) and (L=7,Q=184). The marginal product of the seventh worker is
A. 25 units of output.
B. 184 units of output.
C. 37 units of output.
D. 27 units of output.