Oil production at its highest in the 1980s and still remains important to the economy of Russian Siberia
Answer: Option C
Step-by-step explanation:
Oil production was highest in Russian Siberia in 1908s and remains an important part of the Russian economy even today. Oil production in Siberia was high because of the rich oil fields of this region.
Sibera is home to almost 70% of oil fields of Russia. In addition, it is also rich in ore deposits of almost all metals. There are still unexploited sources of oil and natural gas in Siberia making it an important part of the Russian economy till date.