Geometry

Question Analysis:
This question asks students to recall the essential properties of rigid motions.
The main focus is on congruence preservation, which defines rigid motion.

Key Concept Explanation:
Rigid motions preserve:
Side lengths
Angle measures
Shape and size
As a result, the pre-image and image remain congruent.
Orientation may change (as in reflections), but congruence is always maintained.

Step-by-Step Solution:
Orientation is not always preserved (reflection flips the figure).
Size never changes in rigid motion.
Reflecting over both axes is only one type of transformation.
Congruence is the one property always preserved.

Option Analysis:
A. Preserve orientation → ❌ Not ...