Geometry

Question Analysis:
This question involves understanding the different transformations that preserve congruency.
The main focus is on identifying transformations that do not alter shape or size.

Key Concept Explanation:
A transformation that preserves the size and shape of a figure is called a rigid transformation.
Rotation, reflection, and translation all maintain congruency.

Step-by-Step Solution:
Rotation: Turning a shape around a point without changing its size.
Reflection: Flipping a shape over a line to create a mirror image.
Translation: Moving a shape without altering its size or orientation.
Since all these transformations maintain congruency, the correct answer is D.

Option Analysis:
A) Rotation – Correct but not the only answer.