It is an Adverb. Adverb modifies and functions like an adjective.
        
             
        
        
        
Answer: B)
Explanation:
"but" is the conjunction because it is combining two sentences together
"silently" is the adverb because it is saying <u>to what extent</u> did Lawson "crept" up the stairs
 
        
             
        
        
        
Roosevelt's “Four Freedoms” speech. In it he articulated a powerful vision for a world in which all people had 
( freedom of speech and freedom of religion, freedom from want and freedom of fear. ) 
It was delivered on January 6, 1941 and it helped change the world.