Spoiler alert:
I think Q4 isn't a straight red - but it's two yellows - one for entering the field of play, one for attempting to DOGSO....
@jan wrote in the quiz answer:
"The Laws of the Game 2020-2021 state that "all substituted players and substitutes are subject to the referee’s authority whether they play or not".
And about sending-offs the laws are clear that this only applies if the goal is actually denied. "A player, sent-off player, substitute or substituted player who enters the field of play without the required referee’s permission and interferes with play or an opponent and denies the opposing team a goal or an obvious goal-scoring opportunity is guilty of a sending-off offence."
In this case the goal has NOT been denied. Then this applies (page 109): "A substitute or substituted player is cautioned if guilty of: • entering or re-entering the field of play without the referee’s permission."
...Agree with the quote, however, I think both yellow card offences should be sanctioned here, no?