Dave Has Difficulty Talking to Groups

Dave has difficulty talking to groups. Unfortunately, he has chosen a career in which he must speak to large groups of people. The night before a presentation he tosses and turns, and the resulting lack of sleep makes the situation worse. When he makes a presentation, he often becomes confused and stumbles over his words. As a result, he feels worthless and miserable. Which two criteria of abnormal behaviour are most useful in evaluating Dave's case?

A) Inability to function normally and statistical rarity
B) Statistical rarity and deviance from social norms
C) Subjective discomfort and impairment in normal functioning
D) Deviance from social norms and subjective discomfort