The suggestion that environmental factors contribute to group differences in IQ is supported by the finding that

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All three options provided (children adopted into more advantaged homes, parents in disadvantaged groups who encourage learning, and children who miss a lot of school) suggest that environmental factors can contribute to group differences in IQ. Children who are adopted into more advantaged homes may have access to better education and resources, potentially leading to higher IQ scores. Similarly, parents in disadvantaged groups who prioritize education and encourage learning may help their children to score higher on IQ tests. Finally, missing a lot of school could impact a child's IQ score, as they may not receive the same amount of academic stimulation and exposure to information as their peers who attend school regularly.

The Suggestion That Environmental Factors Contribute to Group Differences in IQ