At the end of billy collins' poem death of allegory, what happens to the allegorical characters?

"it looks as though they have traveled down

that road you see on the final page of storybooks,

the one that winds up a green hillside and disappears

into an unseen valley where everyone must be fast asleep."

In this final stanza, we're drawn to a sad conclusion. The great ideas and virtues seem to have all disappeared into oblivion. An unseen world where everyone is, apparently, asleep.

the answer is b