I believe your answer is D!
overall tone: foreboding
words that help establish tone: sickly prey and shadows
how they create tone: they have dark, ominous connotations
i just answered this question on ed so i know this is correct :)
Basiclly the game but in a book!
For the 3rd one it would be D. You see the evidence when it says “to avoid having students gather in groups”
