When Talking of Classification We Tend to Use Words Like

When talking of classification we tend to use words like 'crazy','madness' and 'insanity' regularly - as if we knew what we meant by those terms) However,we do tend to use these terms in which of the following different circumstances?

A) When someone's behaviour deviates from expected norms
B) When we are unclear about the reasons for someone's actions
C) When behaviour seems to be irrational
D) All of the above