The main idea of the text is that the reasons given by slavery supporters are relative, not universal
<h3>What is a Main Idea?</h3>
This refers to the central theme of a text that contains the message that an author or speaker wants to convey to his audience.
Hence, we can see that based on the complete text, President Abraham Lincoln gave a speech about the fragments of slavery and he talked about  the issues with slavery and the points of pro-slavers were relative and not universal
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This will either be power or reputation. Most likely power, with the fact that they are the accusers. 
        
             
        
        
        
He shows melancholy because he's writing about a missing loved one
        
                    
             
        
        
        
Ambivalent: having mixed feelings about something
Incendiary: used or adapted for setting property on fire
Cerebral: betraying or characterized by the use of the intellect rather than intuition or instinct
Culpable: deserving blame or censure
So the answer is    Option C).