Answer:
D
Step-by-step explanation:
There was not enough industry to supply war effort. Without it, Russia had to rely on purchases from France and England, especially in chemistry and some other stuff (mind you, even helmets were purchased in France!). This creates the second problem of “delievering goods to frontline” and ports.
Russia was not self-sufficient.
Russia received shipments in Arkhangelsk and Black Sea ports. Black Sea route was the best, but when Turkey entered war, it strangled this delivery route by blocking straits.
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