The technique that makes both the excerpts effective is an appeal to logic
Explanation:
Dr Kings's speech emphasises how it will benefit the nation , when all of its citizens work together for its progress. In the two excerpts,there is an appeal to the logic of the people.
 In the first statement, he emphasises how a nation cannot live alone or how and  an individual cannot live alone. 
Logic states, if an individual cannot stay alone, that means he has to co exist with other individuals. As a nation is built by people, and a nation cannot live alone , then a nation has to live on with all the people living together in harmony. 
The two excerpts become very effective when he uses , appeal to the logic technique in his speech. 
 
        
             
        
        
        
Probably C. Upsetting. Although I'm not sure if option D is cut off?
        
                    
             
        
        
        
<span>The answer would be Letter C - I don't think so.
It is not grammitcally correct to place 'it' at the end of the sentence, and adding no word at the end makes the sentence complete. The best choice would be letter C.
Hope that helps. -UF aka Nadia</span>
        
                    
             
        
        
        
Answer:
She did not cheat on the test, for it was the wrong thing to do. 
I really need to go to work, but I am too sick to drive.
 I am counting my calories, yet I really want dessert. 
He ran out of money, so he had to stop playing poker.
I want to lose weight, yet I eat chocolate daily.
Explanation:
 
        
             
        
        
        
"What would happen to America's economy (and its spirit) when high schooler students can no longer work at restaurants? "A teenager behind the wheel is the symbol of America youth," writes author Peter Chacha. What will happen to this symbol if Representant Weaver's plan is approved?" <em>Those lines manifest a broad approach (America's economy and symbol), a generalization of the original topic: safety.</em>