Correct Answer: A
Explanation:
Recall that a rigid motion is that that preserves the distances while undergoing a motion in the plane. This is also called an isometry, rigid transformations, or congruence transformations and there are four different types.
These basic type of rigid motions include the following:
1. Rotation
2. Reflection
3. Translation
4. Glide Reflection
Therefore, of the answer selections, "Expansion" is the term that is NOT a rigid motion.