What, If Anything, Have Adoption Studies Taught Us Regarding the Relationship

Multiple Choice

What, if anything, have adoption studies taught us regarding the relationship between heredity and personality?

A) Adoption studies have confirmed that personality can be strongly influenced by genetics.
B) Adoption studies are a new area of study and have yet to offer any information on the effects of heredity on personality.
C) Adoption studies have not supported many behavioral genetics studies, thus questioning the idea that personality can be influenced by genetics.
D) Adoption studies have resulted in conflicting findings, with some strongly supporting the influence of heredity on personality while others suggest that heredity has no influence whatsoever.