Which of the Following Statements About Toxic Substances Present in the Environment

Which of the following statements about toxic substances present in the environment is NOT correct?

A) There is suspicion that environmental toxins adversely affect the structural or functional components of the nervous system.
B) Researchers are concerned that environmental toxins could have a relationship to the rising number of cases of Attention Deficit Disorder, Autism Spectrum Disorder, and other developmental disabilities.
C) There is concern that environmental toxins could cause asthma and cancer.
D) There is a clear relationship between environmental toxins and disabilities in children.