Which of the Following Is Strong Evidence for a Genetic

Which of the following is strong evidence for a genetic contribution to a behavior?

A) Dizygotic twins have a higher concordance rate than do monozygotic twins.
B) Monozygotic twins have a higher concordance rate than do dizygotic twins.
C) Heterozygotic twins have a lower concordance rate than do monozygotic twins.
D) Adopted children resemble their adopted families with regard to a trait.
E) None of the above are correct.