challenge: Where was Abu Sa'id Abu'l-Khayr born?
  
  A. Khorasan, in the village of Miana, in modern-day Uzbekistan
  B. Khorasan, in the village of Miana, in modern-day Iran
  C. Khorasan, in the village of Miana, in modern-day Afghanistan
  D. Khorasan, in the village of Miana, in modern-day Turkmenistan
  Answer: 