Question

which mountains divide russia into a european and an asian section?
the byrranga mountains
the caucasus mountains
the ural mountains
the sayan mountains

Explanation:

The Ural Mountains are the natural boundary that divides Russia (and the European and Asian continents) into European and Asian sections. The Byrranga Mountains are in northern Russia, the Caucasus Mountains are at the border of Europe and Asia but not the main divider for Russia's European - Asian division, and the Sayan Mountains are in Siberia.

Answer:

C. The Ural Mountains