Answer:
A. Religious leaders and royalists joined the White Army.
B. Over 14 million people died from famine and fighting.
D. The tsar and his family members were executed.
(Photo for proof below.)
Step-by-step explanation:
The Bolsheviks (rulers at the time) signed the treaty of Brest-Litovsk and Russia gave up valuable territory, including a lot of coal and iron mines. Religious leaders and royalists opposed this action and joined the White army, which is an army that revolts against the Bolsheviks. The White Army wasn't sure if they wanted the Tsar, who had been overthrown by the Bolsheviks, back in power. But they did want the Bolsheviks out. This caused the Bolsheviks to arrest and execute the Tsar and his family in fear of the Tsar returning to power.
Here's a photo of Edge incase you're doubtful.