Question

which pair of undefined terms is used to define a ray? line and plane plane and line segment point and line segment point and line

Explanation:

A ray is defined as a part of a line that starts at a point (the endpoint) and extends infinitely in one direction. The undefined terms in geometry are point, line, and plane. To define a ray, we use a point (to mark the start) and a line (to show the direction of infinite extension). The other options include terms (plane, line segment) that aren't needed to define a ray.

Answer:

D. point and line