Which of the Following Statements Is True of Policy Evaluation

Which of the following statements is true of policy evaluation?

A) After a policy has been implemented, it is often challenged in the Supreme Court.
B) Policy evaluation is just an academic exercise and has no real-world consequences.
C) Groups inside and outside government conduct studies to determine how the program actually works after a policy has been in place for a period of time.
D) By 2013, the health-care reforms had been thoroughly evaluated.
E) After a period of evaluation, the president implements and executes the law.