In the first quatrain of William Shakespeare, "Sonnet 130," the central idea is expressed by the sentence where the writer says that the mistress is not as beautiful as nature. Thus, option D is correct.
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Sonnet 130 is a poem by Shakespeare where he compares worldly beauty standards to the woman. The comparison is between the woman and the beautiful things found in nature.
The central idea is defined by the contrast set by the beautiful colors of nature that are not possessed by the woman and hence she is not as beautiful as nature.
Therefore, option D. the mistress is not as beautiful as nature describes the central idea.
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