Which Film Analogy BEST Describes an Epigenetic Mark

Multiple Choice

Which film analogy BEST describes an epigenetic mark?

A) a note a director makes in the script about an idea for a possible sequel
B) a scene that is completely novel and inserted into an existing script by the director
C) a director's decision to include or exclude a particular scene from the original script
D) small random variations in acting performance during multiple takes of the same scene