Answer:
Refundable Materials.
Explanation:
If Douglass buys more refundable materials, held from Seneca Falls, then New York can be his main cause, because the struggle against slavery and racial discrimination was very serious.
So, by learning about this history, you can get the summary of which is: Seneca Falls, then New York because the struggle against slavery and racial discrimination was a very serious topic that will not be treated lightly. 
Thank you all for your time. And that is my reasoning.
 
        
             
        
        
        
I said that It is D: takes
        
                    
             
        
        
        
There is no excerpt in the question.