Song of Myself is a poem by Walt Whitman. Part A is best supported by, for every atom belonging to me as good belongs to you.
Song of Myself is a free verse poem with undefined form and a part of Leaves of Grass. It portrays the joyous celebration in the spontaneous and expanded human state.
The theme is supported and compared to atoms and good as the author wants to depict that every particle of the earth belongs to everyone and is not limited to a few.
Therefore, option A. for every atom belonging to me as good belongs to you best supports part A.
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