C. repairing because it implies he can actually fix them and is not only "messing with" them.
I would say when he goes back to check on her to realize she has hung herself? You didn't post any options... So that is the best thing I have got.
It is insufficient; it only explains how one part if the community - library employees - will be affected.
The tone is important in all writing it conveys the authors attitude towards the topic.
C? to make gregor seem less connected with his parents