The statement that best expresses the central idea of the quatrain is "Your beauty will never fade because you will live forever in the lines of this poem."
What is the third quatrain about?
The third quatrain (a quatrain consists of four lines) in Shakespeare's "Sonnet 18" is about immortalizing someone's beauty. The speaker is telling someone that death will never destroy her beauty, that is, that her beauty will never fade.
That is possible, according to the speaker, precisely because he is writing a poem about that person. Thus, she becomes immortal, that is, lives forever as long as that poem and its lines exist. People will never forget about her and her beauty so long as they read about her in those lines.
With the information above in mind, we can choose option A as the correct answer.
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