Having just learned that their daughter has trisomy 21 and is not a mosaic, the parents are concerned about the possibility of severe mental retardation. Which of the following statements is most...

Having just learned that their daughter has trisomy 21 and is not a mosaic, the parents are concerned about the possibility of severe mental retardation. Which of the following statements is most accurate?

a. Most children with Down syndrome are only minimally retarded and should be able to live a completely normal life.

b. Most children with Down syndrome are severely retarded and institutionalization is usually the best treatment option.

c. Every child with Down syndrome has some degree of mental retardation, but with early intervention affected individuals can live a long and relatively normal life.