The excerpt from the poem that best supports the primary meaning of Stanza 3 is;
- Year after year beheld the silent toil
Stanza 3 is meant to address the struggles of the nautilus which the poet wants humans to emulate.
At the beginning of this stanza, the poet explains that the nautilus exerts effort into creating its lustrous shell. Every year it abandons its old home for the new one.
The primary point being stressed in this stanza is the hard work, struggle, and persistence of the nautilus which the poet praises.
The chosen option illustrates this point.
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The word "hearth" is a noun.
