Question

what marked the end of the russian monarchy?
the russian civil war
the russian revolution
the tsar and his familys move to siberia
the execution of the tsar and his family

Explanation:

The Russian Revolution led to the overthrow of the Tsarist autocracy. While the execution of the tsar and his family (which occurred after the revolution) was a significant event related to the end of the monarchy, the revolution itself was the event that fundamentally marked the end of the Russian monarchy. The Russian Civil War was a conflict that followed the revolution. The tsar and his family's move to Siberia was a consequence during the revolutionary upheaval but not the event that marked the end of the monarchy.

Answer:

the Russian Revolution