How does a performer create a group-storytelling experience?
a.the storyteller sets the story in an unknown and faraway place.

b.the storyteller assembles an audience of outsiders who have never heard his or her story.

c.the storyteller allows the audience to participate with cheers and applause.

d.the storyteller reads the story word-for-word, careful to preserve authenticity.

I believe the answer is: The storyteller allows the audience to participate with cheers and applause

By giving cheers and applause, the audience able to interact with the story tellers and conveying the type of emotion that they felt during the process.  This would make all audiences in the group feel included in the story telling process and it also provides the story tellers with some sort of clue on whether the audiences are enjoying the show or not.