Which of the following statements best describes a version of the efficiency wage theory?
A. Wages are kept higher than market forces would dictate because employers want to induce high effort from the workers.
B. When turnover rates are high, employers can pay workers low wages.
C. The efficiency wage is the lowest wage that an employer can offer workers, for a given unemployment rate, and still market positive profits.
D. Wages are said to be efficient because they allocate resources across economic agents in a welfare maximizing manner.