In Regard to the Positive and Negative Symptoms Associated with Schizophrenia

In regard to the positive and negative symptoms associated with schizophrenia:

A) positive symptoms respond to typical drug treatments while negative symptoms frequently do not
B) positive symptoms are thought to be caused by structural deficits in the brain while negative symptoms are caused by dopamine activity
C) both probably originate from the same organic causes
D) both are more common in women