The purpose of the imagery in this excerpt is to illustrate the author’s calm, contemplative mood. Thus, option "A" is correct.
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.
. Thus, option "A" is correct.
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