If you lived in china during high middle ages you might have used:

ink and paper
a castles drawbridge
a plowshare and moldboard
a university library

If you lived in China during the High Middle Ages you might have used castles and drawbridges. Option B is correct.

China in the Middle Ages was considered as a country characterized by a much better standard of living than many of the other advanced countries. China has always been viewed as one of the more advanced countries.

The Early Middle Ages or Early Medieval Period usually referred to as the Dark Ages, and spanned from the 5th or 6th century to the 10th century CE.

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the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.