Which of the Following Is the Best Evidence That Genetics

Multiple Choice

Which of the following is the best evidence that genetics plays an important role in determining intelligence?

A) Identical twins raised apart have more similar IQs than fraternal twins raised together.
B) Fraternal twins raised together have more similar IQs than non-twin siblings raised together.
C) Children have IQs that are more similar to the IQs of their siblings than to the IQs of their parents.
D) Children adopted from different biological parents but raised by the same adoptive parents have fairly similar IQs as young children.