Final answer:
Polly's demand for an apology from Digory in 'The Magician's Nephew' is justified because his actions led to unnecessary risks and awakened Queen Jadis, posing a threat to themselves and Narnia.
Step-by-step explanation:
In The Magician's Nephew, Digory is surprised when Polly demands an apology for the events that happened in Charn. Deciding whether Digory's actions warrant an apology involves a moral judgment. Digory's actions led them into a world that was not only unfamiliar but also dangerous. Polly's demand for an apology suggests that she feels Digory's choices were reckless and brought them unnecessary risk.
Furthermore, Digory's choice to strike the bell in Charn, despite warnings, resulted in them awakening the evil Queen Jadis. This action brought peril not only to themselves but also later to the land of Narnia. Therefore, from a standpoint of accountability for one's actions, it is reasonable to conclude that yes, Digory's actions were irresponsible, and Polly is justified in feeling that an apology is due for the consequences of those actions.