Why Are Personality Disorders Seen as Distinct from Other Mental

Why are personality disorders seen as distinct from other mental disorders

A) The origin of most personality disorders remains unknown, whereas other forms of mental illness have a clearer path of onset and development.
B) Personality disorders represent some deep-seated element of a person's character, rather than something that was "contracted," as a disease might be.
C) Personality disorders are the most recent classification of psychopathology to be recognized by the psychiatric and medical establishment.
D) Personality disorders are usually easier to cure than other forms of mental illness.