It can be inferred from the passage that the tone of the author is ______.

A．The origins of theatre.
B．The role of ritual in modem dance.
C．The importance of storytelling.
D．The variety of early religious activities.

A．to prevent serious mistakes in performing rites
B．to have the chance of putting masks and costumes on the stage
C．to separate audience and performers
D．to provide a proper site for performance