Lack of sleep or too much sleep
major grade drop
failure to participate in school or habitual activities
        
             
        
        
        
Is there only one answer to the question? If so, I would guess communicating. Although analyzing influences and setting goals could be correct as well. 
 
        
                    
             
        
        
        
(the answer is b)it coulve been a but it say "only" and stress has a lot of effects on the body and c and d are answers to trick you but you have to pay attention to what it actually states
        
                    
             
        
        
        
Start by smoking only 1 cigarrete a day and after using alternative methoths like electronic cigarretes
        
                    
             
        
        
        
Answer:
glucometer
I would appreciate if my answer is chosen as a brainliest answer