Suppose your management professor has been offered a corporate job with a 30% pay increase. He has decided to take the job. What happened to him?

a.) The marginal cost of leaving was greater than the marginal benefit.

b.) The marginal benefit of leaving was greater than the marginal cost.

c.) The marginal benefit of teaching was greater than the marginal cost.

d.) The marginal cost of teaching was greater than the marginal benefit