The second one should be your answer, it makes the most sense. at least to me
Answer: There's a sparknotes and shmoop summary for chapter 7 of the book Night, it describes their relationship perfectly. I suggest you go there.
Explanation: See answer above.
Answer: For, there is nothing more important and more essential that the original self.
What are the choices? If I had to choose a phrase without knowing of any choices, I would put "Bad studying" But im pretty sure thats not the answer you are looking for.