Concrete, perform and reverse mental observations describes which stage?

• A. Preoperational
• B. Sensorimotor
• C. Concrete Operations
• D. Cognitivist

Answer: (C)

This describes the concrete operational stage. In this stage, children around age 7–11 start thinking logically about concrete, tangible problems. They can perform mental transformations on objects they can see or touch and, importantly, reverse those operations in their mind. This reversibility is what lets them understand concepts like conservation—recognizing that quantity stays the same even if the appearance changes (for example, poured into a different-shaped container). They also begin to decenter, considering multiple aspects of a situation, and they can reason about concrete relationships such as class inclusion and seriation. abstract reasoning or reasoning about hypothetical situations isn’t yet their strength; that comes later in the formal operational stage.