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The correct answer is option 3, Ural Mountain Range. The Ural Mountain Range is located in Russia and stretches from the Arctic Ocean to the Ural River. It acts as a natural boundary that separates Europe and Asia. The Ural Mountains are relatively low and do not have as much prominence as some other mountain ranges, but they have historically been recognized as the dividing line between the two continents.
Option 1, the Rocky Mountain Range, is located in North America and does not separate Europe and Asia.
Option 2, the Himalayan Mountain Range, is located in South Asia and is the highest mountain range in the world, but it does not separate Europe and Asia.
Option 4, the Appalachian Mountain Range, is located in North America and also does not separate Europe and Asia.
Therefore, the correct answer is option 3, Ural Mountain Range.