Recent Research on Genetic Causes of Schizophrenia Has Found ________

Recent research on genetic causes of schizophrenia has found ________.

A) no evidence of any specific gene contributing to the development of schizophrenia
B) evidence that a single gene,on chromosome 6,is primarily responsible for the development of schizophrenia
C) evidence that genes on at least three different chromosomes contribute to the development of schizophrenia
D) evidence that genes on virtually every chromosome contribute to the development of schizophrenia