Qilin is a friend, and she is the one in danger, and from no other than Shun. If Shun walks away, the situation is resolved, if Qilin does, her family will be hanged and she will be hunted until her death. It is pretty obvious who needs our help more.
It's hardly so simple. Shun's hand was forced by people inside the Imperial Court into coming here in the first place. He can't walk away from this any more than Qilin can.
The discussion of going to Tulu Huodu's to "gain information" is sort of moot because even if the Wudu Cult has a good idea of who poisoned the Emperor, (a) they are outsiders (i.e. not part of the Imperial Court) and the victims of a frame-up, so I see the likelihood of them having any evidence to exonerate themselves to be very unlikely, and (b) certain interests in the government are dead-set on exterminating the Miao in the area, and they don't give a fuck about whether the Wudu Cult did it or not. Basically, knowing who did it and then knowing how to resolve the situation are two different matters entirely. Just because the Western Snake knows who actually did it, doesn't mean he can do anything right now to stop the army from coming in.
For my part, it's possible that if there was a poisoner, they had access to some really powerful Wudu Cult poisons. If Rong Zhiyu could get something that was subtle enough to be almost undetectable - except by Cao'er, of course - then there's no doubt in my mind that a powerful person like a Grand Eunuch could have done the same. I'm inclined to believe that a lot of people wanted the Emperor dead; nobody we've met seems to have nice things to say about him and his brutal rise to power must have made a lot of enemies that could still hold a grudge. And if that isn't enough, he's a paranoid recluse who's been running the country into the ground. Hell, I could even see why people loyal to Shun might want the Emperor dead - kill the old man now so that his far more competent son can take the reins of power during the current crisis.
I think that we're unlikely to do anything substantial right now to stop the extermination campaign from happening on the Wudu Cult's end. Yes, they might become desperate enough to attempt to take out Lu Bu and Prince Shun in order to save themselves, but I don't think that they're quite at that moment yet. As long as we can stall for some more time on the Prince's end, we can start working towards a resolution.
As for the choice, as crazy at is, I think that B3 iis the one that's most likely to work. Yeah, it might blow our cover, but time really is of the essence here. With B2, it's going to be tougher; considering how on edge everyone is, the soldiers here might assume that we're with the Cult. Kindly, wandering physicians who
just managed to show up before the government sent their troops in? Not exactly an easy sell.
Nevertheless, I'm not too convinced by a lot of the arguments in favour of A. I think that we can do more to resolve the situation from the Prince's end rather than the Wudu Cult's end. Furthermore, I'm pretty sure
Nevill just wants A because he wants to abandon our beloved Yunzi for Qilin, which is totally unacceptable.
I'm still kinda torn, but I guess I'll reluctantly go with
B3 > B2.