Answer:
Answer is Option C: He should list the book as a source on his reference page.
Step-by-step explanation:
When we use a book for reference for our writing, we always list the book as source in our references page. We sue these materials to support our points. Since Raoul used a book from the library to use a source in his research, he should list the book in his reference page as a source.
He doesn't need to email the publisher of the book as per Option A. Nor should he mention the title of the book in his writing as option B. He also doesn't need to call the author for permission as per Option D.