A becuase the others would not make any sense
The composition of the Central Committee of the Russian Social Democratic Labor Party (Bolsheviks), which made the decision on the armed uprising, was elected in the composition of 21 people at the Sixth Congress of the Russian Social Democratic Labor Party (Bolsheviks) on July 26 – August 3, 1917.
I would have to say that the best answer is probably C:
Answer:
It held a virtual monopoly on trade between Europe and Asia as it controlled many of the trade routes. ... It gained control of most land routes to East Asia.