The correct answer is D. The Urals.
The Ural Mountains are a mountain range that runs approximately from the Arctic Ocean to the Caspian Sea, separating Europe and Asia. They are the longest continental mountain range in Eurasia, and are sometimes referred to as the “Urals divide”. The Urals are a major watershed, with rivers flowing to the Arctic Ocean to the north and the Caspian Sea to the south. The mountains are also a major source of minerals, including gold, silver, copper, and iron
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