Answer: Hyperbole
Explanation: it’s very unlikely that they are the smartest and most athletic kids. This could be inferred that they are the best in the world so it’s a hyperbole.
Sentence fragment? Or flashback/ reminiscence. <span />
If you take a look at the name Prospero, you will probably be reminded of the word prosperous. So, we can assume, based on the Prince's name, that he is prosperous, which means rich and successful, which is true, if you've read the story. However, he is a crazy, selfish hedonist, who doesn't think about his subjects at all, but rather just wants to please and save himself.
