OK, I'll bite.
1. C (doing a favor for the top tier flyer hurts someone else who is entitled to the upgrade)
2. A (not exactly the same circumstances as 1-on most airlines, companions assume the same elite level as the elite flyer)
3. C (bump it upstairs so that Mr 1K quits bothering everyone)
4. B (I dislike people who try to scam me and lots of people try to scam me)