Which of the following is the strongest evidence supporting the belief that differences among people in their IQ scores are related in part to differences in heredity?

Question

Quizplus · Accepted Answer

The fact that identical twins who have been adopted by different parents and raised in different environments still have a high correlation in their IQ scores provides strong evidence that IQ differences are related in part to differences in heredity. This is because twins share identical genes, so any differences in their IQ must be due to environmental factors. The fact that their IQ scores are still highly correlated despite being raised in different environments suggests that genetic factors play a significant role in determining IQ. While options A, B, and C also provide some evidence for a genetic component to IQ differences, the evidence from option D is considered much stronger.

Which of the Following Is the Strongest Evidence Supporting the Belief