Answer:
I looked it up and hope this is correct but I think it's B.
<span> Since Walden is based on the author's personal experience which he decided to share, this book can be considered as a narrative essay. In his book, Henry David Thoreau represents all his life experiences and realizations that came up to him when he was living in natural surroundings. In a narrative essay, the writer tells a story about a real-life experience, so I bet that Walden belongs to this kind.</span>
<span>At the beginning of the paragraph, the topic is about how volunteering is beneficial for one's general health as it may include minor-to-moderate physical activity and reduces chronic pain and heart disease symptoms. Then, it explains that not all voluntary work may fulfill this need due to their sedentary nature, and how such should be combined with actual physical activity. From there, the paragraph goes on to say which are examples of everyday activities that can be turned into exercise, which completely diverts from the original idea.
</span>Therefore, your best answer is <span><u>The paragraph contains sentences that wander from the main topic.</u></span>
omg mine is horrible, i have so much homework :c