7. ¿Qué evento desencadenó directamente la caída del zar y la aparición de un gobierno provisional socialista en Rusia en 1917?

a) La derrota de Rusia ante Japón en 1905.
b) El inicio de la Primera Guerra Mundial.
c) Las huelgas y el rechazo del ejército en 1917.
d) La firma de un acuerdo con Alemania para poner fin a la guerra.

The fall of the czar and rise of a socialist government in Russia in 1917 was directly triggered by the Bolsheviks' successful inroads, leading to the establishment of the USSR.

Explanation:

The event that directly triggered the fall of the czar and the emergence of a socialist provisional government in Russia in 1917 was:

By late 1921, almost everywhere in the world, the great revolutionary wave stirred into motion by the First World War was ebbing away.
Radical Russian socialists, known as Bolsheviks, made successful inroads with peasants and workers sick of war.
October 1917, Lenin's Bolsheviks captured many of the major cities in Russia and instituted the Union of Soviet Socialists Republics (USSR).

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