Yes I think the answer is B concrete.
        
                    
             
        
        
        
Racism was the major blow which the American faced. Progressive era was the age in which there was an enormous growth in the economy and the cities were crowded, urbanization resulted, gulf between the rich and poor was huge and racism was also prevalent.  
Segregation of African Americans were not given the right if enfranchisement. Many reformers, educators, journalists rose to the occasion during progressive era to fight for abolition of racism and segregation.  
Washington and W.E.B. Du bois consistently fought for the welfare of African Americans. Jim Crow laws which were emphasizing separate but equal doctrine were abandoned and equality was sought for.
 
        
                    
             
        
        
        
 It was the first ecumenical council of Christian church. 
        
             
        
        
        
Answer:
 C. Its effects stopped all advancements in science and medicine for the next two centuries.
Explanation:
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The Indian Rebellion of 1857 had diverse political, economic, military, religious and social causes. ... The spark that led to a mutiny in several sepoy companies was the issue of new gunpowder cartridges for the Enfield rifle in February, 1857. A rumour was spread that the cartridges were made from cow and pig fat.