What Is a Movie Theme

What is a movie theme?

A) a song heard over and over again on the sound track
B) a unifying idea that a film expresses through its narrative or imagery
C) a pitch, or short description of the film, presented by the producers to the studios they are trying to get to fund the film
D) a recurring element in the story or imagery of the film, such as a lighting scheme or prop
E) a type of genre