If you want to use a book as a source of information, which question would be most helpful in evaluating the credibility of the book?

The author’s identity is most helpful because you can check the writer’s expertise, experience, and possible biases on the subject. The book’s length or topic does not show whether its information is trustworthy, and knowing who has read it is less direct evidence of credibility. So the best choice is “Who wrote the book?”

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