Final answer:
A c. contour map is the most useful type of map for describing the terrain of a very hilly lot.
Step-by-step explanation:
The type of map that is most useful for describing the terrain of a very hilly lot is a c. contour map.
A contour map uses contour lines to represent the elevation of the land. These lines connect points of equal elevation, allowing us to visualize the shape of the terrain. On a contour map, closer contour lines indicate steeper slopes, while more widely spaced contour lines indicate gentler slopes.
For a very hilly lot, a contour map would provide the most detailed information about the terrain, making it the most useful type of map in this case.