Final answer:
More than 80 percent of Russia's population consider themselves to be ethnic Russians, descendants of the Slavic people who migrated to the region over 1,000 years ago. The large presence of ethnic Russians has been shaping demographics both within Russia and in the former Soviet republics.
Step-by-step explanation:
More than 80 percent of Russia's residents consider themselves to be Russians, descendants of the Slavic people who first moved to the region more than 1,000 years ago. The correct answer to the question is: a) 80, 1,000.
Russia is a nation with a diverse ethnic composition. Although the majority are ethnic Russians, over 150 ethnic groups are represented across the country. The ethnic Russians are the descendants of Slavic people who have been in the region for many centuries. The Slavic migration and settlement in what is now known as Russia began well over a millennium ago, drastically predating the provided option of 200 years.
The significant presence of ethnic Russians in the former Soviet republics has contributed to complex demographic changes, particularly after the dissolution of the Soviet Union in 1991. Many ethnic Russians moved back to Russia from these former Soviet republics, affecting the ethnic composition in those countries as well as in Russia itself.