Geometry

Question Analysis：
This question involves analyzing transformation effects such as congruence, orientation change, and movement.
The main focus is on recognizing the combination of translation and reflection as the defining feature of a glide reflection.

Key Concept Explanation:
A glide reflection:
Is a combination of a translation and a reflection
Preserves congruence
Reverses orientation (due to the reflection)

Step-by-Step Solution：
The image is congruent → implies rigid motion
The orientation is reversed → reflection is involved
The figure is shifted along a path → translation is involved
Combining these = Glide reflection

Option Analysis：
A – Rotation changes orientation but not along a straight path
B – Dilation changes size ...