Which tool allows an ArcGIS user to split a long line at each intersection with other lines in a single step?

The tool that effectively allows an ArcGIS user to split a long line at each intersection with other lines is known as Line Intersection. This tool is specifically designed to analyze the geometry of line features and identify intersecting points where lines overlap. When applied, it automatically divides the original line at each intersection, resulting in multiple segments that correspond to the divisions created by these intersection points.

This functionality is particularly useful for maintaining the integrity of spatial relationships in geospatial analysis. The Line Intersection tool ensures that each segment created reflects the appropriate topological relationships and alignments with intersecting features, making it an essential choice for tasks involving the editing and manipulation of line data in geographic information systems.

Other options may include various functions related to lines, but none provide the specific capability to split at each intersection in a single operation as Line Intersection does. Thus, it stands out as the clear choice for achieving this specific goal within the ArcGIS environment.