Access to the Movie "Casablanca," Showing in a Half-Empty Theater

Access to the movie "Casablanca," showing in a half-empty theater, is

A) a rival good because other movies are available in other theaters.
B) a rival good because it is used up as it is seen. It is not enjoyed as a whole all at once.
C) a rival good because individuals were willing and able to pay a positive amount to get in to the theater.
D) a non-rival good because no other movie is available in that theater.
E) a non-rival good because when a new viewer enters the theater, there is not less of the movie for everybody else.