The tone of this story is dark and scary. Upon a bed and breakfast but this place doesn’t exactly turn out how billy except
I'd say the answer is B, 'then soared to the uttermost reaches' - birds soar when they fly high, and it flies 'to the uttermost reaches', which clearly refers to a bird.
No they aren't proper to use in writing class they are considered slang. It would show your teacher that your not interested in sounding educated and proper.
Hope this helps!