Answer:
The correct word that fills the gap is: Irrelevant.
Step-by-step explanation:
It is considered irrelevant since it is not the information the CEO is needing to assess the level of staff turnover. If the information corresponding to salary levels had been required to make adjustments, it would be relevant information.
Staff turnover is related to the level of exits and entries of new employees, and to calculate it requires only the relationship of income and expenses, not wages that must be evaluated by the human resources manager.