Which of the following explains why some people use 1918 as the starting date of the Russian Civil War? a. The last tsar of russia stepped down, causing a new government to form and the Blsheviks to begin to take over the country; b. it was the year the russians got out ot wWI with the Treaty of Brest-Litovsk, so they could focus their attention elsewhere; c. The white army successfully conquered ukraine, showing how powerful they were as a counter force to the red amy, or d. lenin decided to disban the constituent assembly in 1918, which angered people because the bolsheviks were becoming more controlling.