In the argument, the two portions in boldface play which of the following roles? A. This first is a piece of evidence supporting the main conclusion; the second is the main conclusion. B. The first is a false conclusion based on an incorrect premise; the second is the revised conclusion drawn from the corrected premise. C. The first is an opinion the author seeks to refute; the second is the opinion the author supports. D. The first is a prediction that, if accurate, would provide support for the main conclusion of the argument; the second is the main conclusion. E. The first is a generally held assumption; the second is a conclusion that violates that assumption.