It is definitely a reflection over the horizontal (x) axis, but i think the dilation is by 2
        
             
        
        
        
It would be the one where measurement 1m is the side of the triangle, measurement 0.75m is the bottom of the triangle, and measurement 2m is the long side of the rectangle
        
             
        
        
        
Answer:
honestly,I also really didn't know the ans so I took it from internet. hope you won't mind
 
        
                    
             
        
        
        
The answer is D 
 
 Steps 
Take the root of both sides and solve