Which choice best describes the overall structure of the text?
Early twentieth-century architectural historians largely attributed the structural innovations of Gothic cathedrals to an intuitive mastery of masonry, arguing that master builders operated without formal mathematical theory. Later archival discoveries, however, revealed that these medieval guilds relied on rigorous geometric canons, transmitting proportional systems through closely guarded sketchbooks. Yet recent digital stress-modeling introduces a further complication: while these geometric schemas dictated the visual harmony of vaults and flying buttresses, they frequently bore little relation to actual load-bearing efficiency. Thus, the enduring stability of these monuments reflects neither pure empirical intuition nor abstract mathematical optimization, but rather an iterative process of trial, error, and overbuilding.