In 1861, Czar Alexander || issued an order A. freeing the slaves
B. ending serfdom
C. establishing a constitution
D. ending discrimination against Jews

(B) ending serfdom

Explanation: hope this helps !

“In St. Petersburg, Czar Alexander II signed the famous manifesto with provisions on February 19, 1861, the act on liberation of the peasants. Two years later, at the height of the Civil War, President Lincoln on January 1, 1863, in Washington, signed the no less famous Emancipation Proclamation freeing the slaves.”

the answer is a. hope this