Answer:
A is the right answer
Explanation:
the b has comma at wrong spot c only needs one comma d needs an extra comma
 
        
                    
             
        
        
        
Is the United Nations Still Necessary? 
Reasons why: people don't think it's much of a sucess.
Reasons why: the United nations is a huge expence to the United States.
I hope this helped.
 
        
                    
             
        
        
        
The preferred method for asking questions about cause and effect relationships is <span>an experiment.</span>