Usually what element helps you identify the theme of a story is what lesson the main character learns, or any important idea or refrain throughout the story.
A is wrong i think, ya those words are in wrong order.
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<span>To recognize which line in the excerpt from Amy Lowell's "Lilacs" represented above emphasizes consonance the only thing you need is to read it aloud. It is like when you want to focus on the rhyme of some lines. So, according to this rule, I would say that the first option (A. Heart-leaves of lilac all over New England ) is an example of emphasizing consonance.</span></span>
If you still need the answer I believe it is B as a substantiated opinion