The correct option is C Loss of support for the Tsar
The empire had the world’s largest army before the First World War, but it lost around 2 million soldiers and civilians by 1917. The empire faced a huge food shortage, since they spent most of their resources on the war. People who supported the Tsar initially began to favour survival and fulfilling their basic needs. The Tsar’s decisions did not favour peasants and workers which pushed the Russians to rebellion.