What quote best supports the theme of "The Most Dangerous Game?" There has to be a key point that shows the reader what the theme of the story is.

There are a number of quotes that you could use, depending on how you see the story.  The nice thing about literature is that there's rarely just one answer.

Rainsford: Be a realist. The world is made up of two classes--the hunters and the huntees.

Whitney: I rather think they [the prey] understand one thing--fear. The fear of pain and the fear of death.

Zaroff--Life is for the strong, to be lived by the strong, and, if needs be, taken by the strong.