A Wheat Farmer Sells Wheat in a Perfectly Competitive Market

A wheat farmer sells wheat in a perfectly competitive market and hires labor in a perfectly competitive market.The market price of wheat is $2 a bushel,the wage rate is $10,the farmer employs five workers,and the marginal product of the fifth worker is 10.What would you advise this farmer to do?

A) Do nothing because the wage rate and the marginal product of the last worker hired are equal.
B) Reduce employment because the wage paid is less than the marginal revenue product.
C) Increase employment because the wage paid is less than the marginal revenue product.
D) Reduce the product price so that the wage and marginal revenue product will be equal.