What is the term that is used to describe young children's thinking in which they are unable to reverse an action mentally?

Question

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Irreversibility is the term used to describe young children's thinking where they are unable to mentally reverse an action, which means they cannot understand that certain changes can be undone. For example, if they see water poured from a short wide glass into a tall skinny glass, they may think that there is now more water because of the taller appearance of the water level, without understanding that it is the same amount of water. This type of thinking is typical of young children in the preoperational stage of cognitive development, according to Piaget's theory. Choices A, B, and C are related to other aspects of preoperational thinking but not specifically to the inability to reverse actions mentally.

What Is the Term That Is Used to Describe Young