When are extra turns added in Magic: The Gathering?

Extra turns in Magic: The Gathering are added right after the current turn concludes, which is why the option stating this is correct. When a spell or ability grants an extra turn, it specifically takes effect immediately after the turn that produced the extra turn has ended, meaning the current player would finish all phases of their turn—including the end phase—before the extra turn begins.

To give context, the other options are not in line with how extra turns are structured in the game. For example, suggesting that extra turns are added at the beginning of the player's next turn implies that players would need to wait until the next natural turn cycle before they get to play again, which contradicts how these abilities work. Similarly, saying extra turns occur during the combat phase or after players pass in succession misunderstands the timing rules in regard to when extra turns are granted and taken. The flow of turns in Magic: The Gathering is designed for clarity and consistency, which is fulfilled by the correct timing of extra turns occurring immediately after the current turn.