Translations, reflections, and rotations is the set of transformations you can use to check whether two polygons are congruent.
Reflection
is flipping an object across a line without changing its size or shape.
Rotation
is rotating an object about a fixed point without changing its size or shape.
Translation
is sliding a figure in any direction without changing its size, shape or
orientation.
The correct answer between all the choices given is the last choice or letter D. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.