Answer:
c . reflection about x and then reflection about y axis.
Step-by-step explanation:
If we rotate the square again at an angle of 180 degrees it will return the square to its original position.
for example we just do this test
Pick a corner of the square, lets say (x,y)
first ,we relflected the square about x axis (-x, y)
then we reflected it about y axis,which gives us (-x, -y)
To return it back to the original position we do this:
180 degree rotation: ( - (-x) , - (-y) ) = (x,y)
It confirms that option C is the answer.