Which region was known as christendom

a. western europe

b. northern africa

c. east asia

d. byzantine empire

asap i will give brainlist to whoever answers right first

A. Western Europe

Explanation:

Western Christianity, Western Christianity or Western Churches are denominations that designate the part of Christianity, Christianity or Churches (concepts not strictly equivalent) that developed from early Christianity in the regions of the Western Roman Empire, in the cultural orbit of the Latin language (there is also talk of Latin Christianity). All these expressions are commonly used in opposition to the concepts of Greek Christianity, Eastern Christianity, Eastern Christianity or Eastern Churches.

it was important in history as the site of the ancient city of yin

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letter a is the answer