The transformation that was used to create the pattern is reflection. The correct option is C, reflection.
What is reflectional symmetry?
Consider a plane. Consider a design or shape on that plane. Now consider an axis. If we think of that axis as a mirror, and on the opposite side of that axis create the image of the considered shape, then if the shape's image looks exactly like the shape itself, then that shape is called to have reflectional symmetry.
The given figure Starts with the top figure. Now, the transformation that was used to create the pattern is reflection. It can be seen in the image formed below, where each red line shows the line of reflection.
Hence, the transformation that was used to create the pattern is reflection.
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