Concept:A stanza is a grouped set of lines within a poem, functioning as the poem’s main subdivision.Explanation:A poem is often divided into larger sections called stanzas.Each stanza is made up of a specific number of lines and may follow a rhyme pattern or meter.Lines alone are simply separate rows of words, not the major subdivisions of a poem.Therefore, the correct term that fills the blank is "stanza".Answer:C. stanza