Personally, the option I would choose is D. exonerated: out of, to complete the analogy. My reasoning would be that when you are carried by emotions, you are elated, the same way that when you are exonerated, you are deposed, or out of a certain service.
However, the answer that I found people saying is correct all over the Internet is C. coherent : to place, so, I don't know whom you should believe, sorry. :/
Well, illustrative essays are making something clear by adding pictures or examples. So, in some ways, yes.
Answer:
I think the answer is the first one. 'It gives the poem a somber rhythm.' It tells is that Eden was sad and was grieving. Which makes us feel like the mood is dark and sad. I think it could maybe be a bit of the third answer. 'It makes the poem seem like nature is unkind.' It's first talking about leaves and nature, but then talking about someone grieving. So, that means something had to happen, to affect Eden and put her in the state that she is in. That's what I thought when I read the lines.
I hope this helped. :)