Four Employers Have Justified Their Actions as Follows

Four employers have justified their actions as follows. Whose logic is consistent with the logic of efficiency wage theory?

A) Jay develops a new assembly line technology that limits the amount shirking workers may do, so he reduces what he pays his employees so as to make it closer to the equilibrium wage.
B) Kay pays her workers less than the equilibrium wage so they won't have the time or money to look for work somewhere else.
C) Ray pays his workers in a developing country more than the going wage, hoping that they will get a better diet and so be more productive.
D) Ms. Fay pays her workers the market wages, but she hires more supervisors to make sure workers do not shirk.