C. Russia.
Explanation:
Central Asia is a vital region in the global market when it comes to fulfilling the energy needs of the region. Although most of the world's oil still comes from the Middle East, Central Asia (particularly the former Soviet regions of Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan, and Uzbekistan) is rapidly developing, and it has become an important exporter of oil and gas. The majority of these resources flow to Russia, and from there to Western Europe.