Answer:
<em>B. The Ural Mountains separate European Russia from Asian Russia.</em>
Explanation:
In 313 AD, the Emperor Constantine issued the Edict of Milan, which accepted Christianity: 10 years later, it had become the official religion of the Roman Empire.
During this time, it was China that mostly remained a land-based empire. This is due partly to the fact that China occupied a large area of land, and didn't need more resources.
<span>it allowed people to settle in one place, and instead of focusing on all aspects of survival, specialization and trade.</span>
