The Abdication of Tsar Nicholas II in March 1917 and the Collapse

The abdication of Tsar Nicholas II in March 1917 and the collapse of the Romanov dynasty in Russia led to

A) the immediate end of Russia's engagement in World War I through a treaty signed with the German high command.
B) the creation of the Provisional Government, made up of aristocratic and middle-class politicians from the old Duma.
C) the invasion of Russia by German forces who no longer had to fight a unified Russian army, instead confronting disorganized bands of fighters.
D) the formation of a peasant-led revolutionary committee that put the tsar and his family on trial for treason and ordered their immediate execution.