The Reason That Some Economists Advise Central Banks to Never

The reason that some economists advise central banks to never validate a negative supply shock is

A) because the economy's adjustment process is ineffective.
B) the monetary validation causes downward pressure on wages.
C) the monetary validation results in a higher level of unemployment.
D) that there are no short-run effects on any real variables,and so it is not worthwhile.
E) to avoid the possibility of entrenching expectations and creating a wage-price spiral.