The correct answer is becoming an astronomy researcher
For starters, it is the only appositive phrase. It is also non-essential because the sentence conveys full meaning even if it was removed.
        
                    
             
        
        
        
Answer: The cherubin were angels, and in Macbeth's simile the couriers were not blind but invisible horses evidently coming to exact revenge for the murder. The word "horsed" shows that the "sightless couriers" are invisible horses.
Explanation:
 
        
             
        
        
        
If her comments are all about herself and how supreme she is then she is selfish otherwise she is not.