challenge: According to Norman Tindale's estimation, what was the approximate size of the Malintji tribal territory?
  
  A. 1,000 square miles (2,600 km2)
  B. 10,000 square miles (26,000 km2)
  C. 5,000 square miles (13,000 km2)
  D. 3,000 square miles (7,800 km2)
  Answer: 