Kim is taking part in a group discussion about the book they are reading for class. She quickly becomes aware that the rest of the group did not prepare for this discussion. Which action is a definite sign that the group did not prepare?

They keep flipping the pages of their books, looking for something to say.
They seem to be very comfortable reading aloud from the textbook.
They have chosen a section of the book that they think is important to discuss.
They are confident when the moderator brings up a topic to discuss.