Two Children Have Different Biological Parents,but Both Were Adopted in Infancy

Two children have different biological parents,but both were adopted in infancy by the same family.Which statement supports the idea that heredity determines personality?

A) The personalities of the children are more similar to the personalities of their adoptive parents than to their biological parents.
B) The personalities of the children are similar to the personality of the biological daughter of their adoptive parents.
C) The personalities of the children are more similar to each other than they are to their own biological siblings.
D) The personalities of the children are less similar to their adoptive siblings than they are to their own biological siblings.