Geometry

Question Analysis：
This question focuses on whether a specific coordinate transformation can be explained by a glide reflection.
The main focus is determining if a translation and a reflection can transform one point into another.

Key Concept Explanation:
A glide reflection is a combination of:
A reflection over a line (the mirror line).
A translation parallel to that line.
Can affect both x and y coordinates

Step-by-Step Solution：
Point A is (3, 2), A′ is (−3, 6)
Step 1: Reflect over the y-axis: (3, 2) → (-3, 2)
Step 2: Translate up 4 units: (-3, 2) → (−3, 6) (parallel to y-axis)
A′ obtained: Yes, transformation is valid
Therefore, it is a glide reflection

Option Analysis：
A – Incorrect: not over x-axis
B – Correct: glide reflection explains ...