In the following conversation which group discussion technique does han most clearly show? ramona: so you're saying that the evidence collected for pettit's book came from a fictional source? han: yeah. [takes out paper from his pocket and unfolds it] "giovanni fiorini wrote an exquisite piece of fiction, a novel entitled medieval masterpieces. despite the blurb mentioned in the foreword, to this day people depict this book as steeped in historical accuracy, when in fact it is well-played-out imagination written by a master storyteller." a. determining new research goals b. evaluating an author's point of view c. challenging the credibility of sources d. asking clarifying questions