Final answer:
The Split tool in ArcGIS allows a user to split a long line at each intersection with other lines. Therefore , the correct answer options is b)
Step-by-step explanation:
The tool that allows an ArcGIS user to split a long line at each intersection with other lines is the Split tool. This tool allows the user to divide a line into multiple segments at the points where it intersects with other lines. The user can then choose to keep or discard the original line segments.
The Planarize Lines tool is used to ensure that all line segments in a dataset lie on a common plane. It does not split or intersect lines.
The Line Intersection tool is used to find the points where two or more lines intersect. It does not split the long line or perform any modifications to it.
The Trim tool is used to remove parts of a line outside a specified trimming distance. It does not split the line based on intersections.