Answer: The concrete operational stage.
Explanation: The concrete operational stage is the third stage in Piaget's theory of cognitive development and is characterized by the development of logical thought.
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C. always working; requiring effortful thinking
Adolescent egocentrism. According D.Elkind adolescent egocentrism is when young people can not make a difference between their perceptions of what other people means about them and what others really think. Adolescents are mostly focused of themselves and them perceptions ( especially how they look and behave). Personal fable and imaginary audience are parts of adolescent egocentrism.