500
•1340s—Mongols, merchants, and other travelers carried disease along trade routes west of China.
•1346—The plague reached the Black Sea ports of Caffa and Tana.
•1347—Italian merchants fled plague-infected Black Sea ports.
•1348—The plague became an epidemic in most of western Europe.
Which conclusion can be made based on these statements?
(a) The plague primarily affected China.
(b) The interaction of people spread the plague.
(c) Port cities were relatively untouched by the plague.
(d) The plague started in western Europe