In the following passage from “Conversation with Geoffrey Ashe”, how mainly does Ashe develop the understanding that King Arthur’s legend has remained popular over time?

[...] Arthur isn’t purely a medieval character. He keeps fading out and coming back, and he has been pictured differently in different periods. I think there is a constant factor that has a great deal to do with his vitality. One way or another, his legend embodies the dream of a golden age which is found in many societies and mythologies. It’s a haunting, persistent dream. Even modern novelists, well aware that there never was a real golden age, have pictured Arthur’s reign as a time when people of vision and courage were on top for a while, surviving against the odds, and going down gloriously. It’s something we would like to believe in.
A. By pointing out that popularity rises and falls over time
B. By comparing King Arthur to a ghost who has haunted readers for centuries
C. By connecting the “golden age” represented in the legend of King Arthur to a common ideal among cultures
D. By arguing that the story of King Arthur is timeless