I would Choose D because A is not correct because the librarian doesnt do that kind of stuff they just help find books It cannot be B because The internet can always be sus and not always have what you are looking for Its not C Because of the same reason for why B is not the correct answer Hope this helped :D
 
        
             
        
        
        
<span>D. Arsat’s brother was holding their pursuers off with a gun.
According to the excerpt the brother wanted Arsat to continue on so he could keep the people away. He says that they do not have a gun and they'd be intimidated. He says that once he has "fired all the shots" he will catch up since he's a strong runner. 
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Answer:
A is the correct answer because when you shuffle your feet you do it slowly
 
        
             
        
        
        
The complete infinitive phrase in this sentence is 'to learn methods for solving equations', because 'to learn' is the infinitive, but the rest of the phrase also has to be included.