Why Might Children Who Are Raised by Their Biological Parents

Why might children who are raised by their biological parents have better developmental outcomes than children who are adopted into a family?

A) The rearing environment that the adoptive parents provide is not compatible with the child's predispositions.
B) Most adoptive parents fail to develop strong emotional ties to their adopted children.
C) Adoptive parents tend to be older and are less likely to be responsive to the needs of the child.
D) Adoptive parents have smaller families and are more likely to be demanding and controlling in their parenting style.