The "research" part of this assignment:
"Discuss a treatment used to enhance the social skills of individuals with autism spectrum disorders. You will need to conduct a literature search and identify a research article that has been published since 2005 that discusses a specific treatment."
You've done enough research for this class to be able to choose an appropriate database for this assignment. I'd choose a database that includes research in the field of psychology. (Is that hint enough?)
Identify the keywords that you need to search on. It's not too difficult, here.
There are several ways to ensure you're choosing a research article: