Consider a Small,remote Town with Only One Employer - a Gold

Consider a small,remote town with only one employer - a gold mining company.Suppose the current work force is 875 workers,each of whom is paid $6000 per month.In order to attract one additional worker,the employer must increase the wage to $6025 per month.The marginal cost of this additional worker is

A) $5.25 million per month.
B) $21 875 per month.
C) $21 900 per month.
D) $5.28 million per month.
E) $27 900 per month.