The example of autism is included in the unit to demonstrate environmental hazards. highlight the fact that there is no cure. discourage people from getting vaccines. show why it is important to monitor children’s development.

D. Because sometimes there can be an underlying issue to one's behavior(s). It could be a multitude of things, anger issues, ASD spectrum, school, victim of bullying, etc. 
 
From personal experience, not with autism, but with other mental health disorder, everyone thought I was just 'acting out'. No, I was being over-stimulated and needed to change my environment.