Most probably it's option A, because it sets the environment scary, and what all needed to make the story scary is environment & dialogues
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What is the book and who is it by it may take me a while to respond back though
1
. Do some preliminary information gathering
2. Follow-up on interesting and important information.
3.Use Google Scholar to research points that need strong evidence.
4.Gear your report to the audience
5.Include a short, clear introduction
6.Maintain a logical flow.
7.Use your conclusion to convey gratitude and repeat your main point.
8.Compile your sources into an organized list
“Ennui” is a noun of the abstract type