I stick to C--as close to the right fork as possible. I can't imagine making my way to B unless I were far ahead of any cars as I rolled to a stop at the light. And upon the green, I wouldn't feel comfortable having cars try to pass me on the right while sandwiched between cars heading opposite on my left. In general, I prefer the right half of the rightmost lane, as it offers the best chance of escape onto grass, sidewalk, etc, in an emergency.