Dr Travis Says, "People with Intellectual Disabilities Have an IQ

Dr. Travis says, "People with intellectual disabilities have an IQ below 90 and must be diagnosed before age 18. Prevalence figures for the United States are 2-3%. People with intellectual disabilities have deficiencies in adaptive behavior that are lower than expected based on age or cultural background." What portion of this statement is accurate ?

A) It is accurate to say that intellectual disabilities involve an IQ below 90.
B) It is accurate to say that intellectual disabilities must be diagnosed before age 18.
C) It is accurate to say that prevalence figures for intellectual disabilities in the United States are 2-3%.
D) It is accurate to say that people with intellectual disabilities have deficiencies in adaptive behavior that are lower than expected based on age or cultural background.