The long-distance spread of disease-carrying germs may be traced between:

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Sixth-twelfth Century

Eight-fourteenth Century

Seventh-thirteenth Century

Ninth-sixteenth Century

answer is C.

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Detailed Solution

The long-distance spread of disease-carrying germs may be traced between seventh-thirteenth century. In the ancient age, people of different countries used to travel in search of knowledge and curiosity about the culture of another country for trading purposes. Priests, monks, travellers, and traders used to travel for specific purposes. They carried food, plants of vegetables and fruit to eat fresh on the way, food ingredients, medicines, grains, money etc. They carried disease-germs to other countries either with consciousness or by spreading purpose like the Spanish conquerors carried out.

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