I believe it's A.) A means of communication. It depends on what you're using it for in a sentence. Hope this helps! :))
Answer:
I hope this helps, and make sure to either add your own words, or shorten it up.
Explanation:
¨In 1918, the Bolsheviks concluded the Treaty of Brest-Litovsk with the Germans. Now, the Eastern Front no longer existed for the Germans. ... Even with the movement of troops from the Eastern Front, the German offensive failed and the Germans lost the war. Thus, the Russian Revolution did not change the outcome of the war.¨
The answer is D. Principalities were small territories that were run by Russian rulers.
This due because they population was very small, and it still hasn't reached by the mongol Empire But they were very close with Russian Territories
