Which of the following is a reason why monetary policy might NOT be helpful in resolving an economic crisis? a. ) Changes in interest rates can only affect unemployment, doing little to curb inflation. . b. ) At high levels of unemployment, expansionary policy will increase economic growth. . C. ) Businesses may have invested in capital based on predictions of future revenues that might not turn out to be profitable. . d.) Monetary policy can sometimes affect the economy too quickly, as people respond overnight to changes in interest rates