The "Window of Opportunity" for Adolescents Who Are at Risk

The "window of opportunity" for adolescents who are at risk for developing substance use and abuse as a result of major depression indicates that:

A) major depression and substance use usually occur close in time and therefore effective treatment can be put in place for both disorders.
B) major depression usually precedes substance use and treatment of depression provides an opportunity for substance use to be prevented.
C) substance use and major depression have similar origins and therefore respond to similar treatments.
D) substance use usually occurs before a diagnosis of major depression and therefore treatment can and should occur for substance use first.