the answer to this question is A
        
             
        
        
        
Answer:
Untouchables - Considered subhuman, did worst possible work.
Untouchables exist outside the caste system of the Hindu religion because they are considered so low that some think them subhuman. As a result they are regularly subjected to abuse but there have been efforts to change their situation in recent years. 
Brahmin - Priests and learned people.
This is the highest caste/ verna and consists of Priests, Advisors and learned people. 
Shudra - Peasants and laborers
This is the lowest/ fourth caste and as seen, consists of Peasants and laborers. They do the menial work. 
Vaishya - Farmers and merchants
This is the third highest caste/ verna. Consists of Farmers, traders and merchants. 
 
        
             
        
        
        
Political geography examines interactions between political processes and human uses of the earth
        
             
        
        
        
Answer:
The Printing Press
Explanation:
In the 15th century, an invention called the printing press enabled people to share knowledge more quickly and widely. Civilization never looked back. Knowledge is power, as the saying goes, and the invention of the mechanical movable type printing press helped disseminate knowledge wider and faster than ever before.
 
        
             
        
        
        
Less than ten feet above sea level