Adoption Studies Based on the Assumption That If an Attribute

Adoption studies based on the assumption that if an attribute is influenced primarily by genetic factors,then adopted children should

A) resemble their biological parents more than their adoptive parents.
B) resemble their adoptive parents more than their biological parents.
C) be just as likely to resemble their biological parents as their adoptive parents.
D) resemble their biological and adoptive parents to some degree.