Although it's a bit counter-intuitive, Columbia actually never explored North America, instead visiting the other locations on this list instead. This lead to great discoveries but lots of suffering for the local inhabitants.  
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A. They developed an accurate 365-day calendar. does not accurately describe the civilization of the Maya because the Mayan calendar is different from the other calendars.
        
                    
             
        
        
        
They argued that white was the superior race. And that immigrants would destroy the country (: hope I helped!
        
                    
             
        
        
        
<span>B. Daniel Boone
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Well, the Quartering Act required colonists to house and quarter British troops.
It would not be C, B, A, or D. At least from all the knowledge I know.