The Marginal Physical Product of Labor Is

The marginal physical product of labor is

A) the output of the firm divided by the number of workers.
B) the change in total revenues resulting from the addition of one more worker, while increasing one other factor of production.
C) the change in output resulting from the addition of one more worker, holding other factors of production constant.
D) the change in output resulting from the addition of one more worker, adjusting the level of the capital stock accordingly.