Thoreau moves from gazing at the water to burrowing into the earth, just as the excerpt shows progress from observation to contemplation. Thus, option "B" is correct.
Walden is looking for solitude and that's the reason why he moves to this magnificent natural place, to be surrounded by a simple life and that's the point of the progress from observation to contemplation, he became an observer of nature and its different way of work far away from what human life is with other people.
Thus, option "B" is correct.
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