The composition transformation of reflections across the x-axis and then the y-axis results in a 180-degree rotation.
When you reflect an image over the x-axis, each point (x, y) becomes (x, -y). Then reflecting that result over the y-axis changes (x, -y) to (-x, -y). This is equivalent to rotating the original image 180 degrees about the origin.
Therefore, the correct answer is: • a 180-degree rotation.