It seems that you have already filled the correct pronoun in the blank provided. Yes, the correct answer to complete this sentence is the pronoun "this". The pronoun "this" is an example of a demonstrative pronoun. Other demonstrative pronouns also include these, those, and that. Hope this answer helps. 
        
             
        
        
        
Could have forgotten because it's talking about a subject being "you"
        
             
        
        
        
Answer:
a
the answer is a needle, hope this helps
 
        
             
        
        
        
D because all the others are much more formal but with D it’s contrasted.
Hope this helped :)
        
             
        
        
        
hi! idont know excatly what your trying to do 
can you plz give some details thank you