In His Research on Psychological Development in the Tiv, Douglass

In his research on psychological development in the Tiv, Douglass Price-Williams found that __________.

A) there was no difference between Tiv and European children in understanding of conservation of earth, nuts, and numbers
B) even with natively familiar test materials, Tiv children never reached an understanding of conservation to match the European children
C) the Tiv children had a stronger understanding of conservation than European children when tested with earth, nuts, and numbers
D) the Tiv children reached an understanding of conservation at an earlier age than European children, regardless of the testing method