C. Given the premise, I pull over to the right to let traffic pass and then turn when all is clear. If no one is behind me, I do B. If I am not hauling a trailer, I do B.
If I am going slower than the posted limit, or even the normal flow speed, I'll pull over to let someone pass if at all possible. Daddy taught me to avoid being a jack wagon. Slowing down in traffic because you don't like someone else's speed is a jack move. Always figure if someone is going that much faster than me, it must be more important that what I am doing. Pull to the side and let it go. You never know why they are going fast, or if this is the guy who just got dumped or is clinically depressed. Let the sheriff get him later, for now, pull to the side and everyone lives.
When I have to drive equipment on a road (years ago), I hug the right side as much as possible. That gives traffic the better opportunity to pass when they can.