Answer:
The correct answer is option B.
Step-by-step explanation:
The efficiency wage theory states that higher wages will cause the labor productivity or marginal revenue product to increase.
When a worker will be getting high wages he will have incentive to work better to retain his job. With higher wages workers will also be able to afford better health care and food and this will help them work more efficiently.
At lower wages, the productivity will be lower. This is because workers will not have the incentive to work harder at lower wages.