I think because he has very little energy remaining and has been out in the cold for too long.
The answer is C. Climax
The climax is what people have waited for the whole story. It is the one of the main parts of story and often the turning point in the story where the mood may switch, or something of that sort.
Here are some of the ways the families are significant, I'm not sure how far you are in the story yet tho. I read this book last year, so I can't remember which parts these are from
1) The way they have 2 children to a family, one male and one female
2) Raising children were rules in the community
3) The parents aren't the real birth givers of the children, you had to apply for kids
4) Very controlled family with special practices
Hope this helps! (I believe it's all before chapter 10)
