General rules:
Exceptions may be made at the discretion of the mods.
Car D is going to have to wait for car A no matter what
Assuming no cars come after yellow car, it doesn't matter if car C goes or not.
Honestly it's nicer because car D doesn’t have to move up a car length to yield.
Yes they could get screwed very hard though
Yield to traffic in circle, not yield to anything in your perspective quadrant of the circle.. Leave grandpa be, he's running on nothing but cortisol and spite for death. And try to circulate the cabin air, quit huffing the exhaust from tailgating. The don't test emissions in roundabout country...
The pink car is yielding incorrectly, and may cause an accident.
My city has two circles, both one lane with 3 entry/exits. Actually the one not near me might have more, but I know its one lane. Amazing how many people have trouble with them.