u have to first identify what the stories plot is, or the characterization of the conflict. So A
"The Cossack as the cat; he was the mouse. Then it was Rainsford that knew the full meaning of terror" is the best detail that supports that claim.
A would be correct. Think about it; plot contrivances are of the mistaken identity type, so they wouldn't help the mood. Historical accuracy wouldn't either, because its just who was where when. Anticlimax is basically a disappointing end to a story, and trust me, those definitely don't improve the mood. Appropriate comparison makes the most sense.
I hope this is right.
It is supposed to be spelled raining. Hope this helps.
It is a Lyric Poem because it shows lots of emotion.