Final answer:
Based on the dialogue hinting at Nick's recent arrival, it's implied that he was unable to attend Daisy's wedding due to a timing issue, likely a prior commitment. So, the correct option is Option 2: Nick had a prior commitment.
Step-by-step explanation:
The question pertains to a scenario wherein Nick was unable to attend Daisy's wedding. To provide the correct response, we must draw inference from the dialogue which hints at Nick's recent arrival - "I have had the honor of telling you that I have only just stepped out of the train."
This suggests that Nick's inability to attend Daisy's wedding was due to a time constraint, implying that he had just arrived and thus could not have been at the wedding. Considering the dialogue and the possible scenarios, the most appropriate option to choose would be that Nick had a prior commitment, which made him unable to attend. To mention the correct option in the Final Part: The closest scenario we can derive from the information given is Option 2: Nick had a prior commitment.