When assessing the cognitive abilities of children,Dr.Jones finds that Ralph has the ability to conserve length but is still fooled by conservation of mass tasks.As a Piagetian,which term would Dr.Jones use to describe this phenomenon?

A) equilibration
B) disequilibration
C) adolescent egocentrism
D) horizontal décalage

The term "horizontal décalage" refers to the phenomenon in which children may conserve one aspect of a task (such as length) but not another (such as mass), even though both require the same cognitive ability. This is consistent with Dr. Jones' observation of Ralph's abilities. Options A and B refer to Piaget's concept of cognitive equilibrium and disequilibrium, which describe the process of cognitive growth and adaptation. Option C refers to a different concept, adolescent egocentrism, which occurs during the formal operational stage and involves the belief that one's own experiences and perspectives are the only ones that exist.