The answer is Alliteration, Not Onomatopoeia.
The word <em>that </em>is used as a relative pronoun here, it can be interchanged with the pronoun <em>which, </em>and both are used to connect two parts of a sentence.
It is a novel of suspense and secrets. A pastoral novel that slowly tears the pastoral apart.
Answer:
its either A or C
Sorry if it didnt help much