Final answer:
The director says 'Action' to signal the actors to get ready to start the scene. Therefore, the correct answer is a.
Step-by-step explanation:
When a director wants the actors to get ready to start a scene, they often say 'Action.' This is a term commonly used in the film and theater industry to indicate that the scene is about to begin.
Playwrights often include stage directions in their scripts, which provide information about the physical actions and movements of the actors. These stage directions may include specific instructions for the actors to start a scene.
Therefore, the correct answer to the question is 'a) Action.'