You need to take the main parts out of the excerpt to figure out what the excerpt is trying to teach you as the reader. After you determine that you must figure out what the main idea is and the topic of the excerpt. 
Hope this helps. 
        
             
        
        
        
I think it’s either b or c
        
             
        
        
        
It is called the diction. 
Angst, in writing, is like a dark story. One that has a sad, dark, etc. plot to it. On the other hand, tone is how a writer feel towards a topic.