Wage Contracts Are Often Set for Periods of Up to Three

Wage contracts are often set for periods of up to three years. As a result, fluctuations in aggregate demand and aggregate supply tend to

A) cause changes in the amount of involuntary unemployment.
B) either increase or decrease the NAIRU.
C) clear the labour market.
D) have no effect in labour markets until wages are renegotiated.
E) cause greater inflexibility of wages.