We need more information.
It's C. the narrator's insanity makes her an unreliable narrator and it's difficult to understand what's going on because we only get her perception--and obviously the perception of someone insane isn't easy to understand. B is simply incorrect, because first person POV doesn't tell you the thoughts of all characters, and D. is incorrect as well. in no way does it address the reader. in regards to A, we don't really connect with her because we don't understand what's happening throughout the story.
Economy of agriculture. They will take the advantage and grow food for the winter. They will also trade food when the other doesnt have that food species.
