Which of the Following Would Provide the Strongest Evidence Supporting

Which of the following would provide the strongest evidence supporting a genetic link to schizophrenia?

A) higher concordance rates for identical twins than for fraternal twins
B) similar concordance rates for identical twins raised in different environments and identical twins raised in the same environment
C) higher concordance rates for children of parents who are both diagnosed with schizophrenia than for children from one parent diagnosed with schizophrenia
D) similar concordance rates for fraternal twins and identical twins