Answer:
I believe the best answers to be C and B.
Step-by-step explanation:
The narrator is a young boy or girl who is thoughtful to the very core of the adjective: he/she is really full of thoughts. While his/her siblings are screaming and rejoicing over the fact that there won't be classes that day, our narrator is looking through the window, analyzing what the world looks like under a foot of snow. Every single thing is thought over with detail: the appearance of the streets, the lack of noise outside, the dog trying to play with its owner. Nothing goes unnoticed or "unthought of."
When the narrator compares the city to a ghost town, a metaphor is employed. A metaphor is a figure of speech in which two different things are compared without the use of support words such as "like" or "as." The metaphor states that thing A is thing B in order to attribute the quality of one to the other. That's what we have in "The city below was a ghost town." Certainly, the city is presenting characteristic typical of a ghost town: the silence, the howling wind, the lack of people on the streets etc.