In the first paragraph of “Conclusion” in Walden, how does Thoreau explain his departure from the woods?

Thoreau says he left the woods for much the same reason he had gone there: he felt he had other lives to live and could not spend more time in that one. He presents leaving as a transition to another part of his life, not as a rejection of nature or discomfort with the woods. The correct choice is “He explains his departure as the movement from one part of his life to another.”

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