Which of the following statements about autism spectrum disorderis incorrect? 

A. Exposure to environmental pollutants such asmercury has been linked to the development of this disorder. 

B.Genetic factors appear to play a prominent role in the developmentof this disorder. 

C. This disorder involves feeling overwhelmed andsad for extended periods of time. 

D. It is characterized by apervasive pattern of inattention and/or hyperactive and impulsivebehavior.