Answer 1 is the most likely option.
I have not read the book but the hint refers to PROBLEMS that Jack is causing, and challenging leadership and rules seems the most problematic as the rest of the answers seem like helpful behavior.
Answer:
"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."
This is what I found online.
I have never read this book before so...
Sentence 1: Plants can produce their own food.
Sentence 2: Plants their own food,
Sentence 3: Their own plants produce food.
