Which of These Is NOT a Reason It Is So

Which of these is NOT a reason it is so to evaluate insanity?

A) Insanity and psychosis are not the same thing.
B) Defendants are not permitted to be tested after they are charged with a crime.
C) Insanity is a legal concept,not a psychiatric one.
D) Evaluation of a defendant's present status may not be relevant to his or her status when the act was committed.