Answer:
The answer is A) There are hundred of ethnic groups and more than a thousand languages are spoken 
Explanation:
 
        
                    
             
        
        
        
I don’t know if this helps but I found a Wikipedia page with lots of useful information. Sorry I couldn’t give a straight up answer but I haven’t gone over this in class.
 
        
        
        
I believe that eyewitness are not a reliable source to solve a crime or problem. Those eyewitness play a major role in the investigation meaning that they have a advantage to change minds. Some studies think that people over the age of 50 years old aren't reliable for testimony. Though, some might think that study accusation is absurd, it may be correct in some ways.  
Hope I could help! :)