B. the human body is being moved along by an outside force. 
 
Trust me, this is right! I've done the test. 
        
                    
             
        
        
        
1) based on “grove” and “nature” i would assume a variety animal calls
2) “sad thoughts” seem to refer to the “what man has made of man” as it seems the poet is upset that the link of nature and soul is mended in some way. this could be reference towards deforestation or other acts we have caused to destroy nature
        
             
        
        
        
This shows how much Claudius cares about being King and holding onto his throne. 
He knows that the public loves Hamlet, which is why he can't just arrest him for the murder of Polonius, he has to be much sneakier and trickier than that, otherwise the public will take Hamlet's side and Claudius will lose support.