With the different liquids in the glasses, which Piagetian stage describes the younger child's thinking?

• A. Pre-operational
• B. Sensorimotor
• C. Concrete operational
• D. Formal operational

Answer: (A)

The situation is describing pre-operational thinking, where children rely on what they see rather than on logical reasoning about quantity. At this age, kids focus on a single perceptual cue—like the height of the liquid column in a glass—so they tend to conclude that the taller glass holds more, even when the same amount of liquid was poured into different-shaped containers. They haven’t developed conservation of volume yet, nor the reversibility that would let them imagine pouring the liquid back and forth to test whether the amount remains the same. As children grow into the concrete operational stage, they learn to conserve liquid across container shapes and understand that the amount can stay constant despite appearance.