Answer:
show the graph .
Step-by-step explanation:
 
        
             
        
        
        
Hello. 
Have a beautiful and joyful day ahead. 
 
        
                    
             
        
        
        
Answer:
B
Step-by-step explanation:
The area of the biggest rectangle = 

The area of the of the smallest rectangle inside=

Then the area of the shaded region = 

So, we choose B.
 
        
             
        
        
        
Step-by-step explanation:
you can open the file I gave you now. the answer is there