Waiting Room Quandary

If you are sitting in a quiet train waiting room and there is someone sitting directly opposite you, do you...

(A) Stare blatantly at them like some kind of stalker?

(B) Look everywhere in the room except at the person in front of you?

(C) Quickly whip out your phone/book/train timetable and examine it like your life depends on it?

(D) Smile and strike up a conversation?