One of the things that family members and others can do to help children with intellectual disability improve the quality of their lives is

A) encourage children with intellectual disabilities to explore the environment.
B) work with them on basic learning skills such as labeling, sorting, and comparing objects.
C) celebrate their achievements and developmental milestones.
D) all of the above

D) all of the above. Encouragement, assistance with basic skills, and celebrating achievements are all important things that family members can do to help children with intellectual disability.