What did Chloe want to know about Tom's actions?

Chloe's interest in Tom's actions is focused on questioning his irresponsibility, which suggests that there was an expectation of a different kind of behavior from him. This desire to understand the reasons behind his irresponsible actions indicates a concern for not only what happened but also the underlying motivations or circumstances that led Tom to behave in an unexpected way. The context implies that Chloe may have observed a change in Tom's behavior or a specific incident that raised her curiosity about his decision-making process.

The other options don't align with Chloe's inquiry about Tom's irresponsibility. They either assume she is questioning something unrelated to his actions or suggest she seeks understanding in a different emotional direction rather than focusing specifically on his lack of responsibility. Such insights about choosing the right question emphasize the depth of understanding needed in complex interpersonal dynamics.