Why were many Russians upset that the Bolsheviks signed a treaty with Germany to allow Russia to withdraw from World War I?

I am not sure but my best guess would be B??

Explanation:

"The treaty was signed at Brest-Litovsk after two months of negotiations and was forced on the Bolshevik government by the threat of further advances by German and Austrian forces. According to the treaty, Soviet Russia defaulted on all of Imperial Russia's commitments to the Triple Entente alliance."

the answer should be a. the sui empire, the tang empire extended from korea in the west to manchuria in the east.