challenge: What was the origin of the name 'Pozharsky' for Dmitry Mikhaylovich Pozharsky's family?
  
  A. It was given to them by the Tsar of Russia
  B. It was derived from their ancestral home in Klin County
  C. It was taken from the Beklemishev family name of his mother
  D. It was derived from the Russian word for 'conflagration' after their family estate burned down
  Answer: 