Hey there! :D
In the story "The Most Dangerous Game," the general is hunting down humans for sport. In response to this confession, Rainsford says that hunting down humans is murder. We can eliminate any answer choice that has a positive correlation to what the general is saying. He wouldn't join Zaroff in hunting humans if he thought it was murder. He doesn't think it's right either.
We are left with two options. One elaborates that Rainsford is opposed to hunting humans, and the other is that he does not understand why Zaroff is hunting humans. What goes along with what Rainsford's dialogue is saying more than the other? Well, Rainsford doesn't understand why the General is hunting humans. 'This is a grisly joke.' But, he clearly states that he thinks that hunting humans is considered murder. And he clearly expresses the idea that he is very opposed to it. I think the best answer choice is:
"Rainsford's response to Zaroff indicates that... he is opposed to the idea of hunting humans."
I hope this helps!
~kaikers