I Hear America Singing is a book by Walt Whitman, and To be of Use by Marge Piercy expresses hardship. Thus, option D is correct.
Hardship is severe suffering and deprivation of the actual basic rights that make some situation intolerable and makes some people strong. The poem, 'To be of Use' surrounds the theme of gratification and satisfaction.
"I Hear America Singing" explores the patriotic themes and ideas that include the value of the person and how their contribution will pave the way to freedom.
Therefore, option D. hardship is the correct option.
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