Rainsford did not smile. "i am still a beast at bay," he said, in a low,
hoarse voice. "get ready, general zaroff."
this excerpt supports the idea that rainsford has
learned to identify with the animals he hunts.
forgiven general zaroff for his evil deeds.
planned to hunt zaroff through the jungle.
learned nothing from his ordeal on the island.

planned to hunt Zaroff through the jungle.

Explanation:

I am still a beast at bay means he is still waiting for an opportunity to strike.

Predators stalk their prey waiting for an opportunity to attack.  The beast at bay means he is stalking General Zaroff.

c.

Explanation:

the author develops a cold, and scared tone. making the reader shudder with fear, and suddenly become cold. i'm guessing that he's writing a scary novel, or maybe about a chilly december night.

i would pick a. i think this is more of a personal question though.