Answer: the ruins of the once-thriving city feel dangerous and forbidding.
Step-by-step explanation:
Settings refer to the time and the place of the story. The mood refers to the atmosphere of the narrative.
In this option, the word "ruins" and "once-thriving city", reflects the story's settings while the words "dangerous and forbidden* indicates the mood of the story. Here, a negative mood is being indicated based on the words used.