Which view illustrates horizontal alignment?

The plan view is the correct choice for illustrating horizontal alignment because it represents the layout of a project from a bird's-eye perspective, focusing on how features are arranged horizontally in relation to one another. This view captures the alignment of roads, pathways, or any linear features as they would appear on the ground, showing curves, angles, and overall direction without considering elevation changes.

In contrast, the section view is used to represent vertical elements and changes in elevation along a specific slice of the terrain, while the elevation view highlights the features as they are seen from the side, showing height differences but not horizontal relationships. The cross-section view, like the section view, provides insights into the vertical profile and details of a single slice, which is not relevant for understanding horizontal alignment. Thus, the plan view is essential for understanding how different elements interact on the same level, making it the appropriate choice for this question.