Advocates of Active Stabilization Policies, in Defense of Their Views

Advocates of active stabilization policies, in defense of their views, argue that

A) stabilization is less necessary than is commonly advocated by monetarists.
B) discretionary policy in not necessary because automatic stabilizers are sufficient.
C) perfect stabilization is not possible, but moderate improvements in economic performance are possible, such as the response to the events of September 11, 2001.
D) All of the above are correct.