The answer is A. prepositional phrase
7. Happier
8. Taller
9. The most beautiful
10. More expensive
11. Biggest
12. Healthier
No, because as you said it "does NOT contain fact-based details" therefore it is not reliable. If something doesn't contain fact-based details, it isn't reliable.
Your supposed to have this in a text or movie because if you reread it you can find the letter and it will tell you everything you need to know.
