Why Do Cross-Cultural Studies of Memory and Concrete-Operational Thinking Have

Why do cross-cultural studies of memory and concrete-operational thinking have different implications?

A) Concrete-operations are thought to reflect basic universal mental operations, whereas specific memory strategies are tied to specific task requirements.
B) Studies of concrete operational thinking with Inuit and Micmac children found that performance on conservation tasks was tied to schooling, while memory strategies were not.
C) Concrete-operations are tied to specific task requirements, while specific memory strategies are thought to reflect basic universal mental operations.
D) The implications do not differ because there are great cultural variations in both cognitive abilities.