What was an outcome of the bolshevik revolution in russia in 1917?

The Russian Social Democratic Party became "The Communist Party" at the end of World War I, bringing down the empire of Tsar Nicholas II and led by Lenin and a revolutionary group called "The Bolsheviks", so "the Bolshevik Revolution" is the same as "The Russian Revolution" which developed into the comunist state known as:

"The Soviet Union", a new socio political era in Eastern Europe. Thereby the best answer is (D.)

Explanation:

he supported the seperation of church and state. he also promoted religious tolerance.