There was stable & regional unity throughout the period of medieval Europe and Japan because of their society system.
<h3>What did medieval Europe and Japan have in common?</h3>
The Japanese and European societies were built on a system of hereditary classes, that is, the nobles were at the top, followed by warriors, with tenant farmers or serfs below.
However also, there was stable & regional unity throughout the period of medieval Europe and Japan because of their society system.
Therefore, the Option B is correct.
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