A 4-year-old child is shown two identical glasses with the same amount of water. An adult then pours the water from one glass into a tall, thin glass and asks the child which glass has more water. The child points to the tall, thin glass. According to Jean Piaget's theory, this child's response is characteristic of which stage of cognitive development?
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A
Sensorimotor
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B
Preoperational
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C
Concrete Operational
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D
Formal Operational