Although Questions Remain Concerning the Cause(s)of Depression,we Do Know That

Although questions remain concerning the cause(s) of depression,we do know that

A) most major depressive episodes do not self-terminate.
B) women are nearly twice as likely as men to suffer from major depressive disorder.
C) the rate of major depressive disorder is decreasing.
D) major depressive episodes are never preceded by stressful events.