1-64.Based on Current Research,which Statement Is Most Justified

1-64.Based on current research,which statement is most justified?

A) Genetics play such a strong role,they are a sufficient condition for schizophrenia.
B) Genetics increase a person's vulnerability to develop schizophrenia.
C) Genetics may not be sufficient for schizophrenia,but everyone who develops schizophrenia must have some number of "schizophrenia genes."
D) Genetics cannot play a significant role in the cause of schizophrenia because most people with the disorder have no close relatives who have it.