Through Sarah Smith's relationship to the Dwarf Ghost and MacDonald's subsequent explanations of Sarah, how does Lewis illustrate the relationship between Heaven and Hell (and happiness)

What task did the surveyors do? a. they studied the landscape to determine the most direct route for building a road. b. they designed treadmills that lifted blocks of stone to where they were needed. c. they dug trenches and filled them with sand, concrete, and large blocks to form a road.