I believe the answer is b
        
                    
             
        
        
        
The number doubles every month so it'd be 32 in May, 64 in June, 128 in July, 256 in August, 512 in in September, 1024 in October, 2048 in November and 4096 in December! Adding that all together will equal 8190, I believe.
        
                    
             
        
        
        
Answer:
 I think its the 4th one 
Explanation:
75% sure sry if its wrong
 
        
                    
             
        
        
        
In 1845 he began his famous two-year stay on Walden Pond, which he wrote about in his master work, Walden. He also became known for his beliefs in Transcendentalism and civil disobedience, and was a dedicated abolitionist.