Whose Opinion Is Best Supported by the Results of Twin

Whose opinion is best supported by the results of twin and adoption studies?

A) Aaron, who assumes heredity is solely responsible for behavioural development
B) Baron, who believes heredity has a substantial but not total influence on behavioural development
C) Karen, who asserts that heredity has virtually no influence on development
D) Sharon, who asserts that twin and adoption studies are too flawed to yield accurate information about the influence of genetics on development