Geometry

Question Analysis：
This question tests knowledge of rigid motion properties, and whether glide reflections preserve or reverse certain geometric features.
The main focus is distinguishing between preserved (congruent) properties and changed (orientation) properties.

Key Concept Explanation：
A glide reflection is a rigid motion → it preserves:
Distance
Angles
Parallel lines
BUT it reverses orientation because reflection flips direction

Step-by-Step Solution：
A: ✔ Preserved – angles don’t change in rigid motions
B: ✔ Preserved – distances remain constant
C: ✔ Parallelism is maintained
D: ✖ Not preserved – glide reflection revers...