Answer:
Piaget; conservation
Step-by-step explanation:
Conservation: In psychology, the term "conservation" is described as a person's "logical thinking" capability that allows him or her to demonstrate that a specific quantity would remain same or similar irrespective of the adjustment related to the size, container, or shape.
The concept of conservation was first introduced by a psychologist named Jean Piaget in his theory of cognitive development.
In the question above, the given statement signifies Piaget's concept of conservation.