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The momentum rule goes into effect when the B player's momentum carries him into the end zone, and it becomes dead there in his team's possession. It doesn't matter how it becomes dead, or what happens while the B player is in the end zone. So...
1. Same ruling
2. Same ruling
3. Same ruling, if by "out of the end zone" you mean out the side or back of the end zone, and not into the field of play.
Force helps you decide whether a ball that became dead in the end zone is a safety or a touchback, and since neither is the case here, force is not a factor.
If the B runner crosses into the field of play and then runs back in to the end zone, the momentum exception is cancelled, and he has forced the ball into his own end zone, so it will be a safety if the ball becomes dead there in his team's possession.
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