So, the mural only has some species- but we don't know which one, living in harmony. We don't know whether it's humans and we have no reason to think that it might be humans. 
So it can't be A) or D) - those are connected with human activities. 
it's informative to the public about this species so the correct answer is
 B. 'Educating the public about the natural environment'  
        
             
        
        
        
The answer is B. Johnny Cash
        
             
        
        
        
Answer:
The balance in Art is the use of artistic elements such as line, texture, color, and form in the creation of artworks in a way that renders visual stability. 
 
        
                    
             
        
        
        
I think that the answer is D because it's the only right sounding answer.