At which location does Dunny meet Padre Blazon and work among the Bollandists?

Dunny meets Padre Blazon and engages with the Bollandists in Brussels, which is significant in the narrative of "Fifth Business." This encounter highlights Dunny's journey into understanding not only religious scholarship but also his own spiritual journey.

Brussels serves as a backdrop for further personal and intellectual exploration, reflecting Dunny's evolving identity and the influence of European ecclesiastical traditions on his life. The Bollandists, a group dedicated to the study of saints and hagiography, represent a channel for Dunny to deepen his understanding of the mystical elements that permeate his experiences in the novel.

The other locations listed do not encapsulate this specific encounter. The morgue represents death and the tangible aspects of life, whereas the gravel pit signifies a more mundane and earthly experience in Dunny's life. The Grand Circus symbolizes entertainment and distraction rather than the intense spiritual inquiry that occurs in Brussels. Thus, the correct answer aligns with Dunny's significant development during this episode of his life.