What Conclusion Is Consistent with the Results of Twin Studies

Multiple Choice

What conclusion is consistent with the results of twin studies of schizophrenia?

A) Though monozygotic twins are more concordant for schizophrenia than dizygotic twins, genes account for only about 10 percent of the differences.
B) Differences in dizygotic genes account for about 90 percent of the instances of schizophrenia among family members.
C) Differences in genes account for about 50 percent of the differences between people, in cases of schizophrenia.
D) Differences in genes account for about 27 percent of the differences between people, in cases of schizophrenia.