The passage suggests which of the following about the cited "scholars"? A. They believe that a decadent phase is characteristic of any significant artistic movement. B. They reject the popular view of the Renaissance as the apex of architectural achievement. C. They believe that a vigorous and healthy architecture would not usually employ false surfaces or imitation building materials. D. They represent the mainstream in critical and historical thought about the Florentine Renaissance. E. They have focused on such technical matters as the cost of building materials rather than on artistic concerns.