choice C is very dangerous. I have tried that before, and had an accidental discharge by doing so. Yes the gun was pointed in a safe direction, I was by myself, and no one got hurt. I did learn NOT to do that.
I have also had one other accidental discharge when I was about 12 yrs. old. I had a round in the chamber and was getting ready to shoot. When I flipped the safety off, the gun discharged. I always figured it was my own fault and must have had my finger on the trigger. It was a Remington model 600, which from what I understand may have the same issue as the 700 which will do that if it has a certain trigger mechanism, so I am now not 100% certain it was my fault. That being said, it is safest to not chamber a round until you are ready to shoot.
I normally carry my gun without a round in the chamber, but will put one in with safety on if hunting in timber in case all I may get is a quick shot. When I do this I am extra cautious about keeping the gun pointed in a safe direction due to previous experiences.