Which of the following supports a genetic basis to schizophrenia?

Question

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A) Research studies have shown a significant genetic component to schizophrenia. As the genetic overlap between an individual and someone diagnosed with schizophrenia increases, so does the probability of being diagnosed with schizophrenia.
B) Amphetamines increase dopamine levels and can worsen symptoms of schizophrenia. This supports the dopamine hypothesis of schizophrenia, which suggests that excessive dopamine activity may contribute to the development of schizophrenia. 
C) Brain imaging studies have shown that individuals with schizophrenia have larger cerebral ventricles than normal controls. This suggests that individuals with schizophrenia may experience brain atrophy, which may be related to the development of the disorder.

Which of the Following Supports a Genetic Basis to Schizophrenia