Assume That the Product Price Is $4 Per Unit and That

Assume that the product price is $4 per unit and that the hourly wage for workers is $12.Neither price nor wage changes with output.In Table 30.1, the marginal physical product of the third worker hired is

A) 15 units per hour.
B) 4 units per hour.
C) 3 units per hour.
D) 5 units per hour.