Sally's favorite words are "I can do it myself." She is becoming more self-sufficient and even learning some basic reading skills. In which period of development is Sally?

Concrete operational stage of development

Explanation:

By the theory of Jean Piaget, the child goes through four phases of cognitive development.

The pieces of evidence presented in the question can lead us to see Sally is in the concrete operational stage of cognitive development.

This stage goes from seven to twelve years. In it, the child starts to learn more about logical and abstract thinking, grasping the concepts of it, and therefore gaining the ability to comprehend written language and start reading.

Children start being more logical, concrete, and to think hypothetically. In this sense, they become more self-sufficient as they start to realize concepts of danger, trial and error, etc. and can start to take care of themselves more sufficiently.

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