<span>Janice Mirikitani suffered during the war because she was placed in an internment camp. During the war many individuals were placed in internment camps to satisfy the paranoia caused by war-time violence. Mirikitani was no different from many Japanese-Americans who were essentially held against their will.</span>
A foil is the near complete opposite of the main character (whichever character they want you to find a foil for).
Rainsford and Whitney were good hunting friends with numerous similar interests. They could not be foils because of how close in similarity they were. Even when they disagreed on how animals felt about being hunted, Whitney seemed open to and intrigued by Rainsford's points and way of thinking.
Ivan is a near irrelevant character, being a mere Cossack who follows whatever General Zaroff says. He is mindless and has almost zero traits to even compare to Rainsford, let alone any traits aside from a mindless follower to begin with.
The answer would be General Zaroff. This is almost like the cliche protagonist vs antagonist foil. Both of them are hunters, but different kinds. Zaroff got bored with animals and wanted to hunt human people instead, whereas Rainsford had enjoyed the thrill of an animal hunt and thinks that the hunting of people is murder. Zaroff is more heartless and cold, a killer, if you will. Rainsford seems to think highly of actual people, and had no interest in playing Zaroff's game.
The necklace is ironic in the fact that when the necklace is borrowed it is believed to be a real diamond necklace. When she loses the "diamond necklace" she works very long to repay the person she borrowed from because she thinks the necklace she lost was worth much money. When she gives the money to the person she borrowed from and confesses that she lost it she was told that the necklace was a fake and that she worried and worked for many years over nothing. This is an example of situational irony. She thought the necklace was worth very much money when it was really only worth very little
