Sentence 1: A knock was heard at Roy's door. 
 Sentence 3: The salesman began his sales pitch with vigor 
 Sentence 4:  Roy pretended that he was deaf and could not hear 
 Sentence 5:  The salesman felt awkward because he knew Roy heard the knock 
 Option 1: He opened it to find a traveling salesman and the salesman will never feel awkward again. 
 Option 2: He opened it to find a traveling salesman.