Why is King's selection of the memoir form for his work On Writing particularly appropriate?

Their purpose is to create new surprising comparisons that deepen everything by adding details of your choice that are suitable for your story

Sample Response: King wants to explain how he became a "good writer" (King's words) to a fellow writer. Selecting nonfiction, specifically the memoir, is appropriate because memoirs recount personal experiences and development, the exact ideas addressed by King. The memoir makes use of narrative techniques, which would allow an author who is explaining how he became a "good writer" to use evidence from his life easily.