Which of the following is true about the factors that contribute to autism spectrum

Which of the following is true about the factors that contribute to autism spectrum disorder (asd)? neuroimaging studies have found few structural and functional deficits in the brains of individuals with asd, thereby strengthening the role of environmental factors. children with asd are no more likely than other children to have prenatal and birth complications. researchers have been able to identify a specific gene that causes asd, thereby disproving the notion that asd is a result of a combination of genes. children with asd have a higher than average rate of other genetic disorders associated with cognitive impairment, including fragile x syndrome and pku.