I answered A, but it also depends on what the circumstances are. If I am target shooting, I am on the trigger until I have emptied the mag. If I were clearing a room, and I knew someone was in the house I might also be on the trigger gaurd or even pressed against the rear front of the trigger gaurd. If I couldn not see, "night time, or a strange place to me, I would be on the slide. I know how much slack my triggers have, the only accidnent would be tripping or falling accidently and firing the weapon, but in a high stress situation, I would want every advantage I could get, even though it may not be safe. That split second could be the difference.