Is an essential part of russia's hinterland, making up three-fourths of its land and providing a large proportion of its raw materials

a. siberia
b. murmansk
c. moscow
d. st. petersburg

We can reject answers C) and D) :those are two famous cities in Russia, and cities would be too small to take up three-forths of Russia, the biggest country in the world.

Murmansk is also a city: in the North-West of Russia, in the Arctic Circle.

So the correct answer is: Siberia

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