Answer:
The answer is postage.
A postage has to do with shipping payment. A buisness letter doesn't need that but it does need a return address, date, their address.
Answer:
I think when they write an informational text, the writer needs to put on only facts.
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.
C because it sums up the whole passage