Cross-Cultural Differences in Performance on Conservation Tasks Suggest

Cross-cultural differences in performance on conservation tasks suggest:

A) training, familiar materials, and use of native language are important contributors to children's performance on standardized tests.
B) there are few universals in Piaget's stages of cognitive development.
C) experience does not affect the acquisition of the cognitive concepts identified by Piaget.
D) there is little cultural variation in familiarity with the contents used in tests of the cognitive operations identified by Piaget.