-When Hiring Labour, to Maximise Profit a Firm Hires Labour

-When hiring labour, to maximise profit a firm hires labour

A) if the workers are not unionised.
B) until the value of marginal product is greater than the wage rate.
C) until the value of marginal product equals the wage rate.
D) until the value of marginal product is less than the wage rate.
E) until the value of marginal product equals the marginal revenue from hiring the worker.