Which Child (Identified Here by Player Name) Is Most Likely

Which child (identified here by player name) is most likely using private speech while playing a video game?

A) n0thing, who is practising a very easy level in the game
B) autimatic, who is not making any mistakes and successfully completing more challenging levels in the game.
C) Stewie2k, who is playing a new, difficult level for the first time
D) Skadoodle, who is already replaying the game to see how fast it can be completed