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What is Thoreau's purpose in the passage from "Walden"?

I think da answer is C or A but im not sure

A ) to argue for the preservation and reclamation of Walden Pond in the face of human intrusion

B ) to describe the permanence of a natural scene

C ) to explain why most people are not able to appreciate the beauty of nature

D ) to describe his reasons for visiting Walden Pond and its surroundings