Children may master some form of conservation before others. Piaget called this

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Piaget observed that children may demonstrate conservation in one area before another, which he called "horizontal decalage." This means that while a child may understand conservation of liquid volume, they may not yet understand conservation of number or mass. Option A, irreversibility, refers to the understanding that some changes can be reversed while others cannot, which is a related but distinct concept. Option C, abnormal, is not a concept related to Piaget's theory of cognitive development. Option D, egocentric, refers to the tendency of young children to view the world only from their own perspective, which is also a related but distinct concept.

Children May Master Some Form of Conservation Before Others