Answer: d. dilation.
Step-by-step explanation:
A rigid transformations is a transformation which always produces an image that is exactly same shape and the size as the pre- image.
There are four kinds of rigid transformations:
1) translation 2) reflection 3) rotation 4) glide reflection.
They all create congruent images.
A dilation is a transformation that creates an image that is the exactly same shape as the pre-image, but may have a different size.
Thus, The pre-image and image of dilation are not congruent.
