Answer:
A line segment has one dimensions.
Explanation:
A line segment is a part of a line that is bounded by two distinct end points, and contains every point on the line between its endpoints.
Dimension is an aspect or feature of an object.
A line segment, let us say AB has two endpoints and has only one measurable feature that is its length which is actually the distance between the two end points A and B.
Hence, a line segment is one-dimensional.