Four-year-old Jennifer's belief that her mother would want a toy doll for Christmas exemplifies which Piagetian concept?

The belief that Jennifer thinks her mother would want a toy doll for Christmas illustrates the concept of egocentrism in Piaget's theory of cognitive development. Egocentrism refers to the inability to differentiate between one's own perspective and that of others. At the age of four, children often assume that others think and feel as they do, leading them to project their own desires onto others. In this case, Jennifer assumes that her mother would also want a toy doll simply because she desires one herself. This highlights the developmental stage where children's thinking is still centered on their own perspectives and experiences. The other concepts, such as conservation, animism, and object permanence, do not pertain to this situation, as they focus on different aspects of cognitive development.