Which of the Following Would Be Considered a Film's Use

Which of the following would be considered a film's use of form?

A) a highly complex psychological drama's intertwining storylines
B) a character's background story in a witty comedy
C) the use of dramatic lighting to convey a madman's tortured psyche in a slasher film
D) the sound track of a movie sold as an individual recording album
E) the director's publicity notes accompanying the release of his or her latest film