Which poetic element involves agreement in the final sounds of two or more words at the ends of lines?

The correct answer is the element of rhyme. Rhyme specifically refers to the repetition of similar sounds, particularly at the ends of lines in poetry. It creates a musical quality and can enhance the flow and rhythm of a poem, making it more memorable for the reader or listener. Through rhyme, poets can also emphasize particular themes or ideas, contributing to the overall emotional impact of their work.

For instance, in a poem, if one line ends with the word "light" and another line ends with "night," the similar sound at the end of these words creates a rhyme that can lead to a satisfying sense of closure or connection between the ideas presented in those lines.

The other choices represent different poetic concepts. A simile is a figure of speech that makes a comparison between two different things using "like" or "as." A sonnet is a specific form of poem with a fixed structure, often associated with themes of love. A stanza is a grouped set of lines within a poem that serves a structural purpose, but it does not refer to the sound quality of the lines themselves. Understanding rhyme and its role in poetry allows readers to appreciate the aesthetic and emotional layers that poets weave into their work.