Which of the following is a concept associated with Piaget's stages?

The concept of "Concrete operational" is associated with Piaget's stages of cognitive development, specifically the third stage that occurs roughly between the ages of 7 and 11. During this stage, children begin to think logically about concrete events, grasp the concept of conservation (understanding that quantity remains the same despite changes in shape or arrangement), and perform operations on tangible objects. They develop the ability to classify objects in multiple dimensions and understand the principles of cause and effect.

In contrast, the other options pertain to different theoretical frameworks. "Trust vs. mistrust" is a concept from Erik Erikson's psychosocial development theory, focusing on the first stage of a child's emotional development. "Role confusion" is also an Erikson concept that occurs during adolescence, where individuals struggle to find their identity. "Emotional balance" is not a specific term associated with Piaget's theory but rather refers to emotional regulation, an aspect that can be considered in broader psychology. Hence, "Concrete operational" is distinctly linked to Piaget's framework and illustrates how children's thinking evolves in a structured manner.