What Piagetian stage involves the development of hypothetical-deductive reasoning?

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The formal operations stage, which typically begins around age 11, involves the development of advanced cognitive abilities, including the ability to think abstractly and engage in hypothetical-deductive reasoning. This stage is characterized by the ability to think logically and systematically about abstract concepts, formulate hypotheses, and test them through deductive reasoning. While concrete operations (B) represent a step towards more advanced thinking, they do not involve this level of abstract reasoning. Pre-operations (A) refer to the stage before children are able to think logically at all, and advanced hypothesis testing (D) is not a recognized Piagetian stage.

What Piagetian Stage Involves the Development of Hypothetical-Deductive Reasoning