Which of the following is not a true statement regarding developmental disabilities?

Which of the following is not a true statement regarding developmental disabilities?
 
  a. The Association for Retarded Citizens, now called the Arc, has been instrumental in advocating for the rights of persons who are developmentally disabled
  b. Developmental disability refers to developmental problems such as intellectual disability or cerebral palsy that developed before adulthood
  c. Most persons classified as having developmental disabilities have vision or hearing problems
  d. Even after a child is born he or she is at risk of acquiring a developmental disability