Because of the volume of goods that travel to its length
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
The height of a mountain peek above sea level is called its Elevation
I hope this helps! :)
