Jeffrey Quills is seen by his friends as a somewhat strange person. At times he is lovable, warm, and friendly. At other times he can be mean-spirited, uncaring, and hostile to all who know him.
Which of the following general statements about personality most closely matches what friends observe about Jeffrey?

A) People have a standard personality that can be categorized into one of five categories.
B) Psychologists agree that a standard personality component exists in all people.
C) Many studies have found that people do not seem to exhibit stable personalities.
D) Most psychologists have completely abandoned the concept of personality.