Consider the Market for Camera Film

Multiple Choice

Consider the market for camera film.If more people start using digital cameras,which do not require film,

A) the supply curve of film shifts rightward.
B) the demand curve for film shifts leftward.
C) there is a movement up along the demand curve for film.
D) there is a movement down along the demand curve for film.
E) neither the demand curve nor the supply curve for film shifts; instead there is a movement along both.