An 8-year-old child understands that when water is poured from a short, wide glass into a tall, narrow glass, the amount of water remains the same. According to Jean Piaget, this child is demonstrating an understanding of conservation, which is a hallmark of which stage of cognitive development?
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A
Sensorimotor
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B
Concrete Operational
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C
Formal Operational
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D
Preoperational