The sentence that is most clearly about the relationship between a poem's setting and its mood is C. The ruins of the once-thriving city feel dangerous and forbidding.
This refers to the general atmosphere of a story and this is developed with the aid of the author's tone and other literary elements.
Hence, we can see that from the complete text, there is the narration of a poem and how the mood is created through the setting and this is done by the setting of a ruined city that looks dangerous.
The answer choices are:
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