Mark Was Diagnosed with a Moderate Intellectual Disability and Would

Multiple Choice

Mark was diagnosed with a moderate intellectual disability and would be described as a loving and responsive child,who is making progress in a specially tailored educational program.Mark's condition is the result of his receiving an extra chromosome from his mother at pair 21.Mark has

A) cretinism.
B) fragile-X syndrome.
C) Down syndrome.
D) phenylketonuria (PKU) .