I'm not an expert in replay rules as IFAF has a completely different system, but here goes.
1a) Replay reverses the result of the play to A1 being down at B-11. The game clock would not have stopped, so the referee will subtract 10 seconds from the game clock. Game over.
1b) Replay reverses the result of the play to A1 being down at B-9. The game clock would have stopped, so the game clock is reset to the time of A1 going down at B-9. Game clock will start on the ready.
1c) Fourth down fumble rule applies. Ball is returned to B-3. No score, game over.
2) Targeting, B65 is disqualified. Interestingly I don't see an option to move the penalty to the start of the next possession series as you could do if there was a kickoff, so it must be enforced on the try. A try@B-1.5.
3) False start of the second kind. As this is a dead ball foul and the ball never came live, there can be no team B substitution foul. A2/10@B-50, quarter over unless team A spends a timeout to avoid the runoff.