B. adverse selection of wage cuts
The adverse selection of wage cuts is one of the economic theory to explain why wage are less likely to decrease than increase.
Some of this theories revolve around laws and institution: for example, if the firm is paying only a minimum wage to its employees, it is illegal to reduce that wage.
There are other theories that try to identify the factors behind this pattern: one, the adverse selection of wage cuts argument, describe a situation in which if the employer cut all wages in order to meet the poor requests of the market, the employees that are most likely to stay are the less valuable one, as the most valuable will find a new job elsewhere.