What Does the "Vulnerability" Model of Schizophrenia Suggest Is the Trigger

Multiple Choice

What does the "vulnerability" model of schizophrenia suggest is the trigger for schizophrenia

A)  psychological weakness or vulnerability 
B)  predisposing factors that interact with stressful life events 
C)  genetic-based deficiency of certain neurotransmitters 
D)  inherent physical weakness of the brain to deal with stress