Why Can It Be Said That Realism in Movies Is

Why can it be said that realism in movies is a kind of illusion?

A) because there is no such thing as reality
B) because realism ceased to exist as a viable artistic approach decades ago
C) because nothing captured on camera and projected on screen can technically be defined as "real"
D) because no matter how similar to our experience of the world it might appear, realism always entails mediation
E) because the concept of realism has always remained the same throughout the history of the arts