challenge: What is notable about the size of the ancient settlement of Nebelivka?
  
  A. It covered an area of 5-10 hectares and was home to around 500 people
  B. It covered an area of 1000-2000 hectares and was home to over 50,000 people
  C. It covered an area of 260-300 hectares and was home to perhaps 15,000 - 17,000 people
  D. It covered an area of 10-20 hectares and was home to around 100 people
  Answer: 