单选题:皮亚杰认知发展的阶段理论认为,守恒观念出现的关键是(  )

题目内容:
皮亚杰认知发展的阶段理论认为,守恒观念出现的关键是(  ) A.多维思维
B.自我中心思维
C.可逆思维
D.形式逻辑思维

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