challenge: According to Pozdniakov, what is the established reading order of the lines on Rongorongo text A?
  
  A. The order of the lines is the same as the order of the sides
  B. The order of the lines is random and varies between texts
  C. The order of the lines follows Barthel, but the order of the two sides is still uncertain
  D. The order of the lines follows Barthel, but the sides are read in reverse
  Answer: 