I believe that the answer is A, to emphasize a point.
        
             
        
        
        
Answer:
The Civil Rights Movement was an era dedicated to activism for equal rights and treatment of African Americans in the United States. During this period, people rallied for social, legal, political and cultural changes to prohibit discrimination and end segregation.
Explanation:
 
        
                    
             
        
        
        
1) Vaccum your house weekly.
2) Don't drop food crumbs on the floor. If you do, then sweep it immediately. 
3) Clean your backyard well too, remove the weeds etc.
4) Wash the floors with water & soap weekly too.
 
        
             
        
        
        
Answer:
Chronic stress accelerates premature aging by shortening DNA telomeres.  Each chromosome is like a DNA library with two protective caps on the end known as telomeres.  As telomeres become shorter their structural integrity weakens, which causes cells to age faster and die younger.
Explanation
 
        
             
        
        
        
Answer:
The definition of the word foul:
1. This can be used to describe a play that doesn't count in a sports game.
2. This can be used to describe something very disgusting or gross.