Answer:
D
Step-by-step explanation:

 
        
             
        
        
        
Since they are complementary 
 x + y = 90
Sin(o) = Cos (90-0) 
Therefore, Cos x = Sin y = 4/5 [ Because x and y are complementary] 
        
                    
             
        
        
        
A statement is something you are standing for and your sticking to it.
        
                    
             
        
        
        
B i hope it helps if not sorry