If the Output of an Employee Is Dependent on the Marginal

Multiple Choice

If the output of an employee is dependent on the marginal productivity of the employee, the effort of the employee, and random elements (changes) in the production environment, which one(s) is (are) actually easily observable to management?

A) Marginal productivity.
B) Effort of the employee.
C) Random elements.
D) Number of hours on the job.