According to the text, when evaluating the success of crime prevention programs, they should be ...

According to the text, when evaluating the success of crime prevention programs, they should be carefully examined for all of the following reasons except:
 
  a. Measuring what did not happen is nearly impossible.
  b. Crime is usually overreported.
  c. The reduction in reported crime could be the result of the crime prevention program or occur because the responsible criminal or criminals left town, went to jail on some other charge, died, and so on.
  d. Crime can be influenced by everything from season and weather changes, school truancy rates, and the flu.