What was the ultimate fate of Czar Nicholas II and his family?

They were assassinated by officers of the White Army as the Bolsheviks approached the city of Yekaterinburg.

They were held captive and eventually assassinated by Bolsheviks as the White Army approached the city of Yekaterinburg.

They were held captive and eventually released by Bolshevik forces.

The first two options are correct. Czar Nicholas II and his family were held captive by Bolshevik forces following the Russian Revolution. As the White Army, a counter-revolutionary force, approached the city of Yekaterinburg in July 1918, the Bolsheviks executed the czar, his wife Alexandra, and their five children.