Final answer:
Curzon never voiced his love to Isabel; he confesses internally but never communicates his feelings aloud. Option D is the correct answer .
Step-by-step explanation:
The correct answer to the question 'When did Curzon tell Isabel he loves her?' is: D) He never told her he loved her. In the given reference, the text explicitly mentions that the character loves her but has never expressed his feelings to her, stating: "That's the story," he said, concluding. "I love her, though I've never told her."
This reveals his internal conflict and decision to keep his feelings to himself, a common theme in literature where characters struggle with their emotions against the backdrop of challenging circumstances.
Option D is the correct answer.