Question

What is the rule for the reflection?

Answer 1

The figure is being reflected over the x axis (horizontal axis). Any y coordinate that is negative becomes positive, and vice versa. The x coordinate stays the same. 

If we have some point (x,y) as the original point, then it would turn into (x,-y). Note how the y coordinate has a negative on it now. 

So we can say $(x,y) \rightarrow (x,-y)$ which is what choice C is saying. 

Choice C is the answer

Choice D is NOT the answer because the words "y axis" under the 'r' should be "x axis" instead.