When did the assassination of Tsar Nicholas Romanov occur in relation to World War I?

The assassination of Tsar Nicholas Romanov occurred after Russia withdrew from World War I, which was officially in March 1918. The Tsar was executed by Bolsheviks on July 17, 1918, in the aftermath of the Russian Revolution and during the ongoing civil strife in Russia. His execution was part of the broader upheaval that followed the revolution and the abdication of the Tsar in 1917. This timeline indicates that Russia's withdrawal from the war and the subsequent internal conflicts allowed for the environment in which such an event could take place. The other choices do not align properly with the historical sequence of events regarding the timing of the assassination against the backdrop of World War I.