Regarding IQ Similarities Between Parents and Adopted Children, Which Findings

Regarding IQ similarities between parents and adopted children, which findings are most common?

A) Over time, the IQs of adopted children are more similar to their biological parents than their adoptive parents.
B) Over time, the IQs of adopted children are more similar to their adoptive parents than their biological parents.
C) Adoptive parents do not tend to have much influence on their children's IQs.
D) Biological parents do not tend to have much influence on their children's IQs.