Answer:
Reflection.
Explanation:
The choices are
- Translation
- Rotation
- Reflection
- Dilation
The problems refers to a transformation that "flips" the figure about a fixed line. That kind of transformation is a reflection, which is a rigid transformation, that is, it won't change its size or shape.
Therefore, the right answer is Reflection.
Additionally, a figure can be reflected across the x-axis, the y-axis, a line y = x or a line y = -x.