The Interpretation of the common message in Marge Piercy's and Walt Whitman's poems is that useful objects and useful people share one thing in common which is genuine need.
This refers to some that is real and absolutely in needed by people.
Hence, the Marge Piercy's and Walt Whitman's poems emphasizes that both the useful objects and useful people share one thing in common which is genuine need.
Therefore, the Option D is correct.
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