The answer is:
C) the spread of the Russian language and culture to the West
Explanation:
This started within the Soviet Satellite States of Uzbekistan, Turkmenistan etc. Wherever Russian history and language was generally supported.
Following that, the Russification method traveled distant west in the Warsaw Pact States such as Poland, Hungary etc. Still, to this day, large communities in these countries deliver the Russian language. Russification or Russianization is a form of artistic adaptation method during which non-Russian cities, voluntarily or not, give up their culture and language in favor of the Russian one.