Answer:
All of the mentioned options are correct.
Step-by-step explanation:
Most of the Russians were unsatisfied because of the government policy, which led most of the people to live in hard conditions. That was connected with the food shortages, especially during WW1.
Russia was among the last countries in Europe that abolished serfdom, which of course led to different social structure of the country.
Finally, writings of Karl Marx influenced the leaders of revolution to established new form of social cohabitation in the country.