Which Statement Best Describes the Onset of Schizophrenia

Which statement best reflects the heritability of schizophrenia A) Concordance rates for schizophrenia are the same for fraternal and identical twins.  B) Concordance rates for schizophrenia are near 100 percent for identical twins.  C) Schizophrenia is caused by a recessive gene contributed by each parent.  D) Some people inherit a genetic vulnerability to schizophrenia.

Enos and Amir are both currently 30 years old.Enos's biological mother has schizophrenia,but neither of his adoptive parents have the disorder.In contrast,neither of Amir's biological parents have schizophrenia; however,his adoptive mother has schizophrenia.What should you predict based on research that has investigated the role of genetic vulnerability in schizophrenic disorders A) Enos and Amir are both at high risk for developing schizophrenia.  B) Neither Enos nor Amir is likely to develop schizophrenia.  C) Amir is unlikely to develop schizophrenia, but Enos has an increased risk of developing schizophrenia.  D) Enos is unlikely to develop schizophrenia, but Amir has an increased risk of developing schizophrenia.