alleryA baby giggles at peek-a-boo because the baby has not yet fully developed which understanding?
AClass inclusion
BConservation
CTransitivity
DObject permanence
Answer & Solution
Correct answer: D. Object permanence
1. In peek-a-boo a face is suddenly hidden and then revealed.
2. Babies who lack object permanence treat the hidden face as truly gone, so its return surprises them.
3. Seriation, conservation and class inclusion belong to much later stages.
_Source: Wikipedia, Piaget's theory of cognitive development, Sensorimotor stage_
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