Final answer:
The elevation of points A, B, and C can be determined using a topographic map where elevations are represented by contour lines. The highest and lowest points are indicated by the patterns of these lines, and total relief is the difference in elevation between these points.
Step-by-step explanation:
To determine the elevation of points A, B, and C, you would typically use a topographic map where elevations are represented by contour lines. To find the highest point, look for the spot where the contour lines are closest together, indicating a steeper slope.
The elevation of the lowest point along a line and the total relief can often be found by examining the contour lines' elevational change from the lowest to highest point. When considering parallax or the displacement vector, these concepts don't directly give elevation but can indicate relative positions in space or on a graph.