Select the correct text in the passage.
which of these lines from walt whitman's "i hear america singing" describes a unified america?
(i hear america singing, the varied carols i hear,)
those of mechanics, each one singing his as it should be blithe and strong,
(the carpenter singing his as he measures his plank or beam,
the mason singing his as he makes ready for work, or leaves off work,
the boatman singing what belongs to him in his boat), the deckhand singing on the steamboat deck,