The return to monopsony power is

a. the difference between the MRP and the wage rate of the last laborer hired multiplied by the number of laborers hired.

b. the difference between the MRP and the MLC of the last laborer hired multiplied by the number of laborers hired.

c. the difference between the MLC and the wage rate of the last laborer hired multiplied by the number of laborers hired.

d. the difference between the MRP and the wage rate of the last laborer hired divided by the number of laborers hired.

e. the difference between the MRP and MLC of the last laborer hired divided by the number of laborers hired.