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Yana wrote an opinion essay about the book Climbing to the Top. Read her first body paragraph.

One reason I loved this book is because it is so encouraging. The main character helps so many other people, such as his younger sister and the man he works with. He is always putting others before himself, and he is a model for how we should live. He really is a hero.

Which sentence should be the topic sentence of the next body paragraph?
A. He also helps his parents when they get older.
B. You will be so glad you read this amazing and true story.
C. In addition to being such an encouraging story, it is a book that will keep you laughing.
D. The book tells the true story of Joseph Miller, a man who spends his life helping others.