He seemed genuinely surprised . I said , " You do n't look like the people on 2 , and you do n't look like my coworkers . So you must be on 7 . " He laughed . Is that Occam 's razor?The other good way to tell is that one of the occupants on 7 is a firm , and they 're always dressed to the nines .

Question: Why is the man so doubtful about the elevator passengers ?
Answer: None of the above choices .He feels they are dressed shabbily .He feels one of them has a weapon .He does not recognize them .