It is a compound noun. Why? Because 'Back''Pack' is one word, but if you see how i structured it, it can be two. Back, as in your body part, and Pack as in a bag or container, you name it. And just a tip, compound means two words squished into one, ex. CupCake, FireWorks, BaseBall, BasketBall. But when you are typing it, of course, you wouldn't capitalize the first letter of the two words :)
The correct answer for the question that is being presented above is this one: "c. paying tribute." In Life in His Language, when Toni Morrison writes to James Baldwin about “the astonishing gift of your art and your friendship,” she is fulfilling the function of eulogy that is paying tribute.
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My best guess for the answer to this question is that the listener in My Last Duchess interacts with the speaker while the listener in Life in a Love does not. In My Last Duchess, a rich duke is having a conversation with a man about a portrait of his late wife while negotiating a deal to marry a new woman. Life in a Love is about a man's reaction to a woman possibly leaving him. In the first poem, there seems to be a more active conversation going on. I hope this helps. None of the other answers seem as relevant, so I think this is the right one.