Answer:
B. Stretch
Step-by-step explanation:
A rigid motion, also called an isometry, is a transformation that maintains congruence. This means all of the image angles will be congruent to the corresponding pre-image angles, and all of the image sides will be congruent to the pre-image sides.
In a translation, the figure is slid. This does not change angle measure or side length; this is a rigid motion.
In a rotation, the figure is turned. This does not change angle measure or side length; this is a rigid motion.
In a reflection, a mirror image of the figure is created. This does not change angle measure or side length; this is a rigid motion.
In a stretch, a figure is enlarged by a scale factor. This changes side length; this is not a rigid motion.
