A Cross-Cultural Study by Raphael Nyiti (1982) Comparing Performances of 10-

A cross-cultural study by Raphael Nyiti (1982) comparing performances of 10- and 11-year- old children from different cultural groups on a conservation task, suggests that developmental lags may be due to:

A) parenting style.
B) previous training.
C) differences in quality of school instruction.
D) inadequate experimenter/subject communication.