The first documentation about slavery in human history can be found in the

Code of Hammurabi. C

The correct option is: "Code of Hammurabi"

The Code of Hammurabi is one of the oldest sets of laws that have been found and one of the best preserved copies of this type of documents created in ancient Mesopotamia. It is based on the application of the law of the Talion, and is also one of the earliest examples of the principle of presumption of innocence, as it suggests that the accused or the accuser have the opportunity to provide evidence. It was written in 1750 a. C. by the king of Babylon Hammurabi. It is important to mention that this article gives a hierarchy of society, according to it there are three groups, free men or awilum, muškenum (who is speculated could be servants or subordinates, semilibres) and slaves or wardum.

1. it was caused by feudalism

2. charlemagne used christianity as a major cornerstone for his rule. cloisters were built all over the empire to act as centers for the (re)population of the vast european wilderness.

3. the europeans feared the next raid every time chetak

i'm not so sure about #6. but i hope i you with the first 3.