Answer:
C. The line reinforces the idea that the experience was a good one.
Step-by-step explanation:
While the tone of the line may vary slightly with each repetition due to changes in context (option B), the overall effect is to reinforce the positive nature of the experience rather than suggesting irony (option D). The repetition builds a sense of stability and fondness, emphasizing the speaker's appreciation and longing for the past. Therefore, option C, which states that the repeated line reinforces the idea that the experience was a good one, best describes the effect of choosing "And life was good and all was well" as a repeated line in "Lissadell."