Some of the most historically significant and innovative theatres in the world, such as constantine stanislavsky's moscow art theatre and andre antoine's théâtre libre, began as community theatres run by amateurs.

Iwould go with write exactly two extra paragraphs to point out additional information. but the keyword "exactly" throws me off. leads me to believe it's d. go with your gut feeling. either "write exactly two extra paragraphs" or "none of these".