PLZ HURRY Why did Russia sign a treaty and leave the war?

a
They decided to keep the monarchy
b
The country was on the brink of collapse
c
They wanted to explore
d
The country wanted to expand their borders

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".