Geometry

Question Analysis：
This question checks your ability to disqualify a transformation based on the definition of a glide reflection.
The main focus is on determining whether the translation is parallel to the reflection line.

Key Concept Explanation:
A glide reflection must have:
→ A reflection over a line
→ A translation parallel to that line
Let’s check the direction of each translation relative to its mirror line.

Step-by-Step Solution：
A. Reflection over horizontal line (y = −2)
→ Then translate down (vertical) → Translation is perpendicular, not parallel → Not a glide reflection
B. x-axis is horizontal, rightward translation is parallel → valid
C.y = x is diagonal (slope 1), ⟨1,1⟩ is same direction → valid
D.x = 3 i...