Which of the Following Is NOT Required in Order for a Policy

Multiple Choice

Which of the following is NOT required in order for a policy of governmental intervention in the economy to be effective?  

A)  the will to reject sound policy if the policy gets in the way of political considerations 
B)  the ability to estimate the economy's potential level of output 
C)  the ability to predict what would happen without intervention 
D)  an assortment of effective tools of discretionary policy