The 4th one 
Explanation 
He is done talking.
        
             
        
        
        
The conclusion that can be drawn from this table is option D “Nearly twice as many people were executed between 2000-2006 then between 1990-1996.” In the period between 1990-1996, 238 people were executed whereas in the period between 2000-2006, 459 people were executed so the number doubled between one period and the other.  
Option A is incorrect since the data included not only black and white people but all races.
Option B is also incorrect since there was not significant increase in executions between 1993 and 1994.
Option C is incorrect since the chart does not include the information about the age of executed people. 
 
        
             
        
        
        
To inform or explain something to the audience 
        
             
        
        
        
The noun clause is <span>how the Aztecs made their astronomical calculations.
</span>Just invert the whole sentence - The subject of my next paper is <span>how the Aztecs made their astronomical calculations.
</span>The whole clause is used as the direct object.