Wages Tend to Be "Sticky" Because

Wages tend to be "sticky" because:

A) contracts are often negotiated for long terms and cannot be easily changed.
B) workers are less likely to work as hard if their pay may be cut due to market performance and not their performance.
C) constantly changing wages creates uncertainty and costs the employer a lot of time and energy to change wage rates.
D) All of these are possible reasons why wages might be sticky.