They usually develop because of a dramatic, unpleasant event in childhood.
A.Violet is a very talented and a very competitive tennis player. She loses her temper fast and sulks for days whenever she loses a match.
B.Sammy doesn't especially like going to parties or talking on the phone with his friends. He prefers reading in his room and playing with his dog.
C.Natalie hasn't made friends at her new school after she moved because her parents got divorced. She spends a lot of time in her room and has trouble studying.
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