The relationship that Emerson describes as the central idea between art and nature is that "Art is superior to nature because it is more beautiful." (Option A)
Another word for main idea is "Central Idea". This is the dominant thought in the text that holds all other elements together.
Hence, option a is the correct answer.
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Full Question:
What relationship does Emerson describe between nature and art?
A. Art is superior to nature because it is more beautiful.
B. Natural beauty is the inspiration for art.
C. Art helps us appreciate the natural beauty that we would otherwise ignore.
D. Nature is much more beautiful than art.