Which Statement Should a Nurse Identify as the Most Accurate

Which statement should a nurse identify as the most accurate description of the DSM-IV-TR's definition of a mental disorder?

A) A mental disorder is said to exist when an individual's behavior deviates from the group norm.
B) A mental disorder results when an individual is unable to cope with the stressors of everyday life.
C) A mental disorder exists when subjective distress causes the individual to fail at many tasks.
D) A mental disorder is a clinically significant behavioral or psychological pattern that is associated with present distress or disability.