My answer is "B". This nonsense about letting other people go first makes great sense as long as there's a steady supply of the ignorant who aren't waiting for YOU to go first. It's this kind of let everyone else take the risk mentality that has 4-way stops becoming the greatest impediment to traffic we've ever created. Not to mention that in the middle of the day when the roads are full of cotton-tops and blue-hairs who are full of unpredictable acts of kindness, usually in the form of "let the fat guy on the bike go ahead" I'd be there forever waiting for them to go first.

I prefer to look instead. If the cross lanes are full of stopped cars the risk is pretty easy to gauge.

Getting passed on the right by someone who blows off a right turn only lane has happened, but they're in a hurry and are long gone by the time I'm even through the intersection.

Regardless, I thought I'd share an interesting viewpoint:

So my neighbor is an EMT, who works predominantly on the north side of town in sketchier neighborhoods. I asked him once if he dealt with a lot of accidents involving cyclists. "All the time." I asked if it was mostly kids, or adults. "Adults, by far. Almost never kids." I asked what sage advice he had for cyclists. "When you get to the corner, walk your bike across." 8-)