"Bruno, trying to change the subject, asks Shmuel if he has any sisters. ... There is an tragic irony in Shmuel's statement that he wants to work with animals in a zoo, because he and the other prisoners are currently being treated like animals—lower than animals, even, as they are killed with impunity."
Okay, so people need to see the paragraph first then, based on context clues and her feelings she expresses in the paragraph, then conclude the answer.