Which refers to the main acting space of a Classical Greek theatre?

Question

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The orchestra was the circular playing space at the center of the amphitheater in Ancient Greek theatre where most of the action took place. A is incorrect because the eccyclema was a wheeled platform used to reveal interior scenes to the audience. C is incorrect because the skene was a building located behind the orchestra used as a backdrop for actors, and D is incorrect because a chiton was a long tunic worn by actors in Ancient Greek theatre.

Which Refers to the Main Acting Space of a Classical