Choose any one of the texts (Hint: Choose the shortest one)
Use the races strategy: Restate, Analyze, Cite and Evidence to explain where you found the author's purpose (the reason behind the text). And prove how you found it.
The author's purpose could be to inform, persuade or to entertain.
So you would have to prove the author's purpose from the article, and how it (the evidence) supports the author's purpose