Which statement below best describes the transformation of parallelogram wxyz to parallelogram w' x' y' z'?

a a reflection across the x axis
b a reflection across the y axis
c a reflection across the x axis and then across the y axis
d a translation of 8 units down

The answer is B <<<<
A reflection across the x axis means that any point is moved down the same number of squares as that point is above the x axis. 

It is like seeing your reflection in a mirror. Your face looks like it is the same distance behind the glass as you measure your face in front of the glass.