Where does Dunny have a notable experience depicted as "like swimming in molasses"?

The phrase "like swimming in molasses" vividly describes Dunny’s experience in the trenches of Passchendaele during World War I. This metaphor highlights the extreme difficulty and discomfort he faced in the trenches, which were often filled with mud and grime, making movement laborious and challenging. It conveys a sense of heaviness and the struggle to proceed through a tough and unyielding environment, much like how one would struggle to move through thick, sticky molasses. This imagery effectively captures the overwhelming nature of the war experience, reflecting both the physical and psychological burdens that Dunny, as well as many soldiers, endured during this horrific period in history. The other options do not carry the same weight or significance that relates to Dunny's transformation and the profound impact of his wartime experiences.