In Family Studies,how Do Researchers Assess Hereditary Influence

Multiple Choice

In family studies,how do researchers assess hereditary influence

A)  by comparing the resemblance of adopted children to both their biological and adoptive parents on specific traits 
B)  by comparing members of one family to unrelated individuals to see how much they resemble one another on specific traits 
C)  by comparing blood relatives to see how much they resemble one another on specific traits 
D)  by comparing the resemblance of identical and fraternal twins on specific traits