challenge: Who was Feodosia Morozova's husband?
  
  A. Boris Morozov, the tsar's tutor
  B. Prokopy Feodorovich Sokovnin, okolnichy and her father
  C. Tsar Alexis, the ruler of Russia
  D. Gleb Morozov, brother to the tsar's tutor Boris Morozov
  Answer: 