Answer:
B. The alphabet
Explanation:
The Russian language is written with the Cyrillic script, which was developed in Medieval Bulgaria based on the Greek script used at the time in the Byzantine Empire. In fact, the name "Cyrillic" comes from the name of a Byzantine monk: Saint Cyrill.
The Cyrillic script is also used in Ukraine, Serbia, Bulgaria, and Belarus.
The Chinese worked on railroads when they migrated to america
A major reason for Japan's policy in Asia was to obtain natural resources.
The answer to your question is gunpowder weapons.
siege warfare.
armored cavalry.
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