This is all pretty subjective because one person may have one type of a feeling about this extract, and the other person may have completely different feelings.
For me personally, this simile creates a gloomy mood. The simile 'the hollow halo it was in was like an icy crystal cup' creates a gloomy and cold atmosphere in my opinion.
I would probably go with C
Answer:
Because, in theory, they know more about life in general.
