Martin is upset that his older sister has two cookies while he has only one. His sister cut Martin's cookie in half, and he is satisfied that they now have the same number of cookies. According to Piaget, Martin is most likely in which stage of cognitive development?

Question

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Martin's satisfaction after his cookie is cut in half, thinking he now has the same amount as his sister, demonstrates a lack of understanding of conservation (the idea that quantity doesn't change despite changes in the shape or appearance of objects). This is characteristic of the preoperational stage of cognitive development, according to Piaget, which typically includes children ages 2 to 7.

Martin Is Upset That His Older Sister Has Two Cookies