Nearly Everyone Sometimes Experiences Periods of Sadness or of Feeling

Nearly everyone sometimes experiences periods of sadness or of feeling down or depressed.However,these feelings,although common,are not likely to be diagnosed as depression by psychologists.This is because

A) periods of sadness must also include a component of anxiety or worry to qualify for a diagnosis of depression.
B) only lasting episodes of depressed mood that interfere with a person's life and cause significant distress would require a diagnosis and treatment of depression.
C) psychologists do not diagnose or treat depression;the diagnosis can only be made by a medical doctor.
D) people who suffer from "the blues" often don't realize that they are depressed and so they don't seek treatment.