challenge: What is the distinction between the two terms used to refer to Russians in the Russian language?
  
  A. One term refers to ethnic Russians, and the other refers to Russian citizens
  B. One term refers to people from urban areas, and the other refers to people from rural areas
  C. One term refers to people who speak Russian as a first language, and the other refers to people who speak Russian as a second language
  D. One term refers to people born in Russia, and the other refers to people who have obtained Russian citizenship
  Answer: 