Which of the following is NOT a reason noted by researchers as to why boys do better than girls in math?

Question

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Researchers have found that girls tend to have the same abilities as boys in math, and that their performance is often affected by social and environmental factors, such as parental expectations and societal messages about gender and math. However, they do not believe that girls' belief in their own talent is a significant factor in the gender gap in math performance.

Which of the Following Is NOT a Reason Noted by Researchers