Answer:
It's option D. the exposition
Explanation:
The Exposition is similar to the “setting” part of a story. It provides you with background information about the story or characters. It also explains the begging of a story. In your case, we are being told that the setting is in Arthurian times and this itself, is the exposition as we are being “exposed” to the time period of the story.
Oh, this book is amazing!!! The release of anyone is called "release". Unless you are talking about the cerimony.
Chorus theres are common in plays especially in movies