The Term Compensating Wage Differential Refers To

The term compensating wage differential refers to:

A) the bargaining capacity of a monoposonist in the labor market.
B) wage differences that arise from differences in the risk involved in different jobs
C) whether or not a firm offers a 401K plan to all its employees or just some employees.
D) wage differences that arise from difference in productivity of the workers in a firm.
E) the negotiating powers of the trade union.