It can be inferred from the passage that, beginning in the 1980s, historians of cartography A. placed greater emphasis on the beauty of maps made after 1800 B. expanded their range of study to include more material created after 1800 C. grew more sensitive to the way mapmakers prior to 1800 conceived of their work D. came to see the visual details of maps as aesthetic objects rather than practical cartographic aids E. reduced the attention they paid to the technical aspects of mapmaking