Answer:
a) the effectiveness of mass production. 
Explanation:
Henry Ford was the first car producer (Ford Industries) to use the assembly line, which allowed certain groups of workers to work on specific parts of the car, while simultaneously transferring the component throughout the groups to create a full car at the end. This allowed Ford to create large amounts of cars in short amount of time, decreasing not only cost of production, but also the cost to buy the car, further making the car more popular with the people. This cycle allowed for cheap cars, which in turn made Ford rich. 
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Harry S Truman The Buck Stops Here means I'm the ultimately responsible person in this organization. Other people can pass the buck to me, but I can't pass the buck to anyone else.
        
                    
             
        
        
        
Both feminists and Civil Rights activists wanted equal rights for all. Feminists want men and women to be equal, and Civil Rights Activists wanted white and coloured people to be equal.
Hope this helps :)
        
                    
             
        
        
        
To capture John Hancock and John Adams
        
                    
             
        
        
        
D. None of the above, because it is a strong example of a multi-nation state.