The statement that the mistress is not as beautiful as natural elements best summarizes the central idea of quatrain'.
A quatrain is regarded as a stanza, which has four lines and the rhyme scheme of such lines is of alternate nature.
The above quatrain is taken from the Sonnet 130 by William Shakespeare, which goes with the title 'My Mistress' eyes are nothing like the Sun'. Its central idea is to show that the nature is superior to the human beings.
Hence, option A holds true regarding the central idea of Quatrain.
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