sec16-05，我对问题的理解对不对？

5. Archaeologists have found wheeled ceramic toys
  made by the Toltec, twelfth-century inhabitants of
  what is now Veracruz. Although there is no archaeo-
  logical evidence that the Toltec used wheels for
  anything but toys, some anthropologists hypothesize
  that wheeled utility vehicles were used to carry
  materials needed for the monumental structures the
  Toltec produced.
  Which of the following, if true, would most help the
  anthropologists explain the lack of evidence noted above?
  (A) The Toltec sometimes incorporated into their
      toys representations of utensils or other
      devices that served some practical purpose.
  (B) Any wheeled utility vehicies used by the Toltec
      could have been made entirely of wood, and
      unlike ceramic, wood decays rapidly in the
      humid climate of Veracruz.
  (C) Carvings in monument walls suggest that the
      Toltec’s wheeled ceramic toys sometimes had
      ritual uses in addition to being used by both
      children and adults as decorations and playthings.
  (D) Wheeled utility vehicles were used during the
      twelfth century in many areas of the world,
      but during this time wheeled toys were not
      very common in areas outside Veracruz.　（Ｂ）
  (E) Some of the wheeled ceramic toys were found
      near the remains of monumental structures.