Why Is Light the Essential Ingredient in the Creation and Consumption

Why is light the essential ingredient in the creation and consumption of motion pictures?

A) Light allows color to be recorded and seen.
B) Light prevents film stock from decaying over time.
C) Movie images are made when a camera lens focuses light onto film stock and when movie theater projectors transmit motion pictures as light.
D) Sound recordings are actually created via the manipulation of light.
E) It isn't; since shadow play, photography, and other moving-image arts use light to create their effects, film is far from unique in employing it.