B. He should put someone over before retiring. Sorry, I just don't like the whole "passing the torch" saying.
Triple H putting a wrestler over in his last, official match can do wonders for them. There's a select few that I think would fit under Triple H, though. Those select few are: Antonio Cesaro, Damien Sandow, Wade Barrett, and Drew McIntyre. I would have said Kassius Ohno, but I see him easily feuding with John Cena and Undertaker.
The first three I listed, I think can handle themselves well when it comes to mic exchange with Triple H, especially the first two (Antonio Cesaro and Damien Sandow). Those two can talk and have more layers to their mic skills, in my opinion, than Wade Barrett and Drew McIntyre. Wade and Drew aren't far behind, though. First two, however, are the best fit in terms of exchanging with Triple H on the mic. The reason why I'm talking about the promos is because this is also an important factor in putting/getting someone over.
In terms of working in the ring, all would do great. Most of them do have similarities, yet all different in their own way. Who are the two that I think can mesh well with Hunter in the ring? Antonio Cesaro and Drew McIntyre. We should all know that Antonio Cesaro is a seasoned vet and his European style of wrestling is entertaining. Drew McIntyre, on the other hand, is still young but has a nice style to him than say, Wade Barrett, who's mostly brawling.
In terms of the future, I'd say Antonio Cesaro, Damien Sandow, and Drew McIntyre. Now, I know you'll ask why did I even name Wade Barrett if he didn't make any of the options. Well, it's because he's the fallback plan (at least my fallback plan). Antonio Cesaro and Damien Sandow are starting off at a steady (or a bit slower) pace since their debut, which is GOOD. They're not being overexposed like Wade Barrett was. Both are being shown little by little, not revealing everything, so kudos to WWE for doing that. Watching both of them before their debuts, their future is bright as Heaven. These two have more potential than Wade Barrett, in my opinion. Drew McIntyre is still very young (27, at the moment), and still has loads of untapped potential. He "flopped" (more like WWE flopped, not him), yet he's been off TV for a while that I think him being overexposed is no problem anymore. As I said, he's still young so you can still build onto him by heaps.
With all that said, who should Triple H put over in his final match? Antonio Cesaro. Drew McIntyre is a close second. Maybe I'm just being biased since I want to see AC hit the Giant Swing, UFO, and Very European Uppercut on him, but I think they blend well together and AC is the total package. Triple H's final match, if putting someone over, should automatically launch a wrestler's career. Antonio Cesaro is the one who's primed and ready for that push and can run with the ball, becoming huge in WWE. That's just my two dollars and fifty cents.