Answer:
Russia's World War I efforts intensified conflicts that were present since many decades earlier. WWI's main impact on Russian politics was Fuel and food shortages caused by losses on the eastern front that led to revolutions in 1917 (C).
Step-by-step explanation:
Russian economic development in the late 19th century happened violently and at the cost of violent exploration of workers. This fast industrialization and explicit exploration created fertile soil for the spread of socialist ideas.
In the early 20th century Russian workers revolted and went on strike several times, for what they were severely oppressed. The revolt on the armored cruiser "Potemkin" represented in the famous October movie by Eisenstein happened at this moment, in the Revolution of 1905.
World War I deteriorated life conditions for Russian workers, causing hunger and thousands of deaths, and triggered the second moment of the Russian revolutions, that is, the Revolution of 1917.