Answer: Rainsford ultimately has to decide if he will kill or be killed.
There are a lot of dark actions in this story, and the above quick synopsis highlights two of them: General Zaroff decides to hunt humans for sport, and Rainsford has to decide whether to kill Zaroff or get killed. The intentions and eotions, as you can imagine, are diverse: fear of death, anger at being hunted, the need to survive... there are more, but this will give you a start.
Explanation:
Because it is asking what Rainsford had to decide that was really dark
Think it this way. Should humans know everything or about everything, or are there certain things humans shouldn't know about?
Answer: you know it's never good to fool people because it'll come back on you twice as bad and people can find out about it and really get angry with you
Explanation: