All right, now to the actual reasoning.
Bai Jiutian is certainly suspicious of us, since he questioned the young monk to the point that the latter almost spilt what he had sworn to keep a secret. This was a dick move by him, and it calls for a dick move of our own.
C would not win us a tournament if we were up against an adult. An experienced warrior does not concern himself - or herself - with such matters. They would fight stark naked, if the situation called for it. It would be silly to lose your life because of your top falling off in an actual combat, in fact, they might just as well make the best out of it and use it as a distraction to gain an advantage over their enemies.
But this is a tournament for youths. At the end of the day, Nie Mudan is just a young girl, and - how should I put this? - too proper even for her age. The worst taunt that she could muster was to call us a rogue who hides our face? Did she think she would get a rise out of us with just that? Apparently, she had a strict upbringing and a somewhat rigid view as to what is considered decorous and seemly. There is just no better target for our tactics. It should render her completely helpless.
Besides, the girl really has to watch her tongue. Doubting our manliness and challenging us to prove it? What would be a better retort to that than to have her demonstrate her own womanly charms before the eyes of a full stadium? Jing wouldn't be Jing if he allowed such a perfect irony go to waste.
The jury and the sects are not our friends here. It is obvious they disapprove of some out-of-nowhere fighter who keeps kicking the crap out of their best disciples. But the crowd loves us. We are a dark horse, a hot topic, a spice in a dish that had become somewhat stale. We provide the best entertainment, the kind of which they haven't seen in years.
If we win the sympathies of the crowd, then even if a fact that we are Zhang Jue's disciple comes to light, nobody will dare to as much as point a finger at us. People will think they are just jealous, and nobody would believe that such a charming and an easygoing fellow who can set people laughing is some kind of a creepy assassin. The crowd would be the only one to vouch for us when nobody else would. We are their idol, and we should not disappoint them.
All of this reinforces my desire to go C.
But what the hell - C just sounds so lulzy I can't resist, even if there is a chance it could get us kicked out of the competition (just because it is not explicitly forbidden doesn't mean the judges would find it as funny as we would, and they get the last word).
Oh, I dare them not to admit our win. They will only discredit their name in front of the people. The same people who would accept our victory unanimously because they'd love to watch this kind of thing more often in future tournaments.