Which of the Following Is True About Factors Contributing to the Development

Which of the following is true about factors contributing to the development of schizophrenia?

A) Strong evidence for a single genetic component to schizophrenia exists and fully explains the connection between genetics and the disorder.
B) All people with schizophrenia show structural and functional abnormalities in the brain including highly active prefrontal cortex and smaller ventricles.
C) Prenatal and birth difficulties have been implicated as factors contributing to the development of schizophrenia.
D) Prenatal exposure to viruses during the third trimester of gestation decreases the risk of developing schizophrenia as it allows the fetal immune system to build resistance.