Montgomery, a biologist who is also well read in archaeology, has recently written a book on the origin and purpose of ancient monumental architecture. This book has received much positive attention in the popular press but has been severely criticized by many professional archaeologists for being too extreme. Montgomery' s views do not deserve a negative appraisal, however, since those views are no more extreme than the views of some professional archaeologists. The argument is most vulnerable to which one of the following criticisms? ["It fails to establish that professional archaeologists' views that are at least as extreme as Montgomery's views do not deserve negative appraisal for that reason.", "It provides no independent evidence to show that the majority of professional archaeologists do not support Montgomery's views.", 'It attempts to support its position by calling into question the motives of anyone who supports an opposing position.', 'It assumes without warrant that many professional archaeologists consider biologists unqualified to discuss ancient architecture.']