Answer: E. Learning Curve
Explanation: The learning curve is usually adopted in evaluating the association between cost and output over a certain period of time. The learning curve shows how usually indicates the changes in cost and output associated with a task as employees or workers start to engage in a certain task or function. Generally, initial task performance by an employee usually result in higher cost output with gradual reduction in cost becoming visible as the Repetition of such task is being embarked upon by the employee.