A) cut
B) thumb behind the top of the head, index finger underneath
C) thinking about it, I do the opposite to uncut men. I push the skin I have left forward when I piss, so the ridge of the head isn't fully bare. Don't know why, just habit I guess.
I remember as a teenager seeing a guy who would probably have been the age I am now, standing at a urinal pissing. He was circumcised too and instead of holding his shaft, he pinched the little collar of leftover skin between his thumb and index finger, just to the side of his dick. It was really hot to watch because it left his head fully bare and free. Sometimes when I think of that guy I do the same, just to relive that erotic memory.