Geometry

The correct answer is: C. ray with endpoint C.

1. Analyze each option based on geometric definitions:

A.Segment with endpoints C and D: A line - segment has two endpoints and no part of it extends infinitely. Since the figure in the picture has an arrow indicating infinite extension in one direction, it is not a segment. This option is incorrect.

B.Line containing points C and D: A line extends infinitely in both directions. The given figure only extends infinitely in one direction starting from C, so it is not a line. This option is incorrect.