Answer:
D. Simon and Hillary have been friends since preschool 
Explanation:
The explicit idea stated in this sentence is: "Simon and Hillary have been friends since preschool"
From the given sentence, it is explicitly stated that Simon and Hillary have been friends since preschool. The "He" in the sentence is actually referring to Simon. 
When something is explicit, it means that it is clear enough without any hidden detail. Therefore, the sentence made it clear that Simon and Hillary have been friends since preschool. 
 
        
             
        
        
        
B. White people never had the right to decide what should be accomplished in Africa. (APEX)
 
        
                    
             
        
        
        
Answer:
Giving a counterargument allows the essay/writing to contain more perspectives that strengthen the claims as more perspectives allow the reader/viewer to see an overall "picture" of the argument. Also, being able to "debunk" the counterargument as false or not strong will help in strengthening your own essay/argument.
Including only your side of the argument leaves the reader/viewer no perspective of the whole topic.
 
        
                    
             
        
        
        
Yeah but just make sure to give reasons why in the sentence after that