Two-year-old Duncan, a participant in a study of self-evaluation, is trying to complete a difficult puzzle, but he doesn't realize that he is trying to make a piece from a different puzzle fit into the one in front of him. After trying unsuccessfully for a while, Duncan is most likely to

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Two-year-olds, like Duncan, often exhibit short attention spans and can easily become frustrated or lose interest in tasks that are too challenging or if they encounter a persistent problem they cannot solve, such as trying to fit a piece from a different puzzle.

Two-Year-Old Duncan, a Participant in a Study of Self-Evaluation, Is