Researchers who use intelligence testing as part of their research project with elementary age students are likely to be researching _________ development

Ty is fairly handsome, but not as handsome as he thinks he is. He doesn't care about anyone but himself and is sure that everyone around him feels the same way. He is MOST likely experiencing:

A) schizoid personality disorder. B) narcissistic personality disorder. C) schizotypal personality disorder. D) obsessive-compulsive personality disorder.

Changes in an individual's circumstances may lead to changes in personality

Indicate whether this statement is true or false.