Peggy’s parents are amazed at how much their daughter has changed. Over the past year, she became interested in doing chemistry experiments. Peggy predicts what will happen when she combines two chemicals together and then observes the results to see whether her hypothesis was correct. Peggy is most likely in the stage of cognitive development

Formal operational

Explanation:

  The formal Operational stage is one of the type of final stage in the cognitive development process as in this stage the thinking ability of the  adolescents are manipulating the thoughts and the ideas.

The formal operation stage begins in the adulthood at the age twelve and the children basically using this type of stage for creative thinking and doing various types mathematics calculation.

 According to the given question, Peggy is using the formal operational stage as she is interesting in doing various types of chemistry related experiments and she combine two different types of chemical for verifying the given hypothesis.

 Therefore, Formal operational is the correct answer.      

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