Which of the Following Statements Is True About Autism Spectrum

Multiple Choice

Which of the following statements is true about autism spectrum disorder (ASD) ?

A) The symptoms of ASD have their onset between ages six and nine.
B) The best predictor of the outcome of ASD is a child's IQ and the amount of language development before age six.
C) The prevalence of ASD is not affected by socioeconomic status and parents' mental abilities.
D) The prevalence of ASD has been decreasing in recent years, probably due to increased awareness of the disorder.