Which sentence from " after twenty years" uses descriptive language to create mood?

"The curtains were covered in dust and smog, like the rest of the city, both slowly decaying in their age."

I think that there are several different sentences that change the mood of the story, but since I don't know what your teacher emphasized on I can't promise that this is the right answer.

The sentence, "“Twenty years is a long time, but not long enough to change the shape of a man’s nose," changed the mood for me while I was reading this passage. It shifted the story from a chilly night and happy meetings to concern and even possibly dread.

I hope this helps.

the answer would be d. he tells the story through a teenage narrator.

it would be d because the however is more proper and the comma is placed in the right spot