Regarding Vulnerability of the Development of Schizophrenia

Regarding vulnerability of the development of schizophrenia,

A) cognitive deficits in attention,perception,and information processing indicate the presence of neurological defects.
B) pooled data from 40 studies indicate there is a genetic vulnerability.
C) neurological damage during prenatal development can increase vulnerability years later in adolescence or early adulthood.
D) all of these are strong possible factors.