A reader needs to ask, what does the author want to convince you of.
Explanation:
If asking the authors position, you will only find the opinion of the author. While this can also be used to find a claim it isn't always the most effective.
If asking what the issue is in general, you can't find the authors claim from the start.
If asking the reasons, that will help you find the reasoning, not the claim.
A film about a journalist who refuses to get a job with an online news service because he believes that print newspapers are the only way to report the news.