The correct explanation of how the Russian Revolution affected Russia's involvement in the war is:
A. The Russian people were dissatisfied with the War which led to peace negotiations.
The Russian Revolution in 1917 led to a change in the government and a desire among the people for peace, ultimately resulting in the signing of the Treaty of Brest-Litovsk between Russia and the Central Powers in March 1918, marking Russia's exit from World War I.