Answer:  The pax Mongolica was made possible by Mongol policies that promoted stability. The Mongols built sturdy roads and made sure that they were safe to travel on. They also established a uniform code of law to ensure the entire empire shared a legal system.
 
        
             
        
        
        
I am 100% sure the answer is A
        
                    
             
        
        
        
I don know because it is not right
        
             
        
        
        
The highest in the caste system are the Brahmins.