I think its D but I'm not sure
        
             
        
        
        
The practice of caloric restriction involves consuming a balanced diet but restricting your caloric intake by approximately 25% below the level of energy consumed in a freely chosen diet.
 
        
             
        
        
        
Certified answer cred due to : 
brainly.com/profile/HistoryGuy-343799One way in which classification is used at school is the separation of different subjects and subject materials. For instance one day you may go to a math class, while another day you may go to a french class. 
 
        
        
        
Fires in grasslands prevent the growth of shrubs. Plants can survive in these fires because most of them have parts underground, where fire cannot reach. Animals and runners aren't affected by this, because they can leave.