The correct options are
C Seizure of power by the Bolsheviks
D Brest-Litovsk Peace Treaty
In the April Theses, Lenin promised to end Russia’s involvement in World War I, condemning the war as an imperialist battle.
After the October Revolution, Germany imposed the Treaty of Brest-Litovsk by threatening to resume their attack on Russia if the agreement was not signed immediately. According to the treaty, Russia had to give up about 30% of its territory. The treaty ended Russian participation in World War I.