I want to get to the state of moral cleanliness.
        
             
        
        
        
Answer:  At this point, he is curious and excited.
Explanation:  While there is sadness (as he is coming from a time that was the worst in his life), he can't help but be a little excited at what is to come.  This is new hope, new adventure, new life.  While he has adapted quickly to his surroundings, he can't help but wonder what is yet to come.
 
        
                    
             
        
        
        
Answer:
I think it is C:  It leads to Algernon withdrawing his marriage proposal.
Explanation:
 
        
             
        
        
        
The correct answer is D.
The author talks about the great diversity of birds that can be found Madagascar's fauna and thinks this is "triuly marvelous". 
By saying this, the author is giving his personal opinion and thoughs, making the statement subjective, rather than objective.