Answer: A) And sings a solitary song.
Step-by-step explanation: alliteration is a literary device that consists in the repetition of the beginning sounds of consecutive words, or words that are close to each other. From the given options, the line that best illustrates an example of alliteration, is the corresponding to option A: And sings a solitary song, because of the repetition of the "s" sound at the beginning of the words "sings," "solitary," and "song."