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The best example of Alliteration from Romeo and Juliet is the option D "O single-sol'd jest, soley singular for the singleness".
Alliteration
In oxford dictionary the word alliteration means the occurrence of the same letter or the sound. In literature too, the meaning of Alliteration is the repetition of identical initial consonant sounds in successive or closely associated syllable.
As far as the question is concerned, in the option D there is occurrence of word "single" three times. Hence, option D is correct.
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