Why is it significant that Whitman discusses the mechanic, carpenter, mason, and boatman?

Answer: C. It gives readers an appreciation for hard labor jobs
Explanation:
The jobs talked about by Walt Whitman in this poem are the jobs of the working class people, the proletariat. These are those who do jobs that involve their hands and hard labor.
Often times we look down on these people or rather forget the hardship that their jobs entail yet feel their importance in no small measure. In mentioning them in this poem, Whitman is trying to instil appreciation for the workers and their jobs in the reader.
It is significant that Walt Whitman discusses the mechanic, the carpenter, the mason, and the boatman in "I Hear America Singing" because:
C. It gives readers an appreciation for hard labor jobs.
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