We Don't Typically See Wages Fall in Response to an Economic

We don't typically see wages fall in response to an economic downturn because:

A) labor supply adjusts so that the market stays at the original equilibrium wage level.
B) there is often little change in the labor market in response to economic conditions.
C) they are "sticky" and are slow to respond to shifts in the economy.
D) the government sets tight regulations on how firms compensate their employees.