A teacher pours equal amounts of juice into a short, wide cup and a tall, thin cup while a 4-year-old watches. The child insists the tall cup holds more juice. According to Piaget, the child has not yet acquired which of the following?
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Answer: B
Object permanence: Object permanence (knowing objects exist when unseen) develops in the sensorimotor stage, long before age 4.
Conservation of liquid quantity: Correct. Preoperational children center on one dimension (height) and do not yet understand that quantity is unchanged by a change in shape; conservation typically emerges in the concrete operational stage.
Hypothetical-deductive reasoning: Abstract hypothetical reasoning belongs to the formal operational stage (adolescence) and is not what this task measures.
Symbolic or pretend play: Symbolic play is a hallmark the child already has in the preoperational stage; it is not tested by the juice task.
Classic conservation tasks reveal preoperational centration: the child judges by one salient dimension rather than recognizing that amount stays the same.