The underlying information an author is revealing to the reader about life is called a poem's: D. theme
In English literature, a theme can be defined as the underlying meaning, salient abstract point or main idea of a poem that are revealed directly or indirectly depending on the author (writer). Thus, a poem's theme refers to the insight about life that is revealed by an author to the reader.
This ultimately implies that, the underlying lessons, meanings, or insights about life and human nature that an author reveals to the reader is called a poem's theme.
In conclusion, you should discover the main idea of a poem to determine and understand its theme.
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