According to Jean Piaget's theory of cognitive development, the 'Formal Operational Stage' (approximately 11 years to adulthood) is characterized by hypothetico-deductive reasoning and abstract thinking. In this context, if an adolescent is given the problem: 'If all birds can fly and penguins are birds, can penguins fly?', and logically concludes that 'according to the statement, penguins must be able to fly, even though this is not true in the real world', this mental process is the clearest evidence of which high-level cognitive capacity?

According to Jean Piaget's theory of cognitive development, the Formal Operational Stage is the final stage, spanning from approximately 11 years to adulthood. Its core features include hypothetico-deductive reasoning and abstract thinking.

Key Characteristics:

• Children no longer require concrete, physically present objects to solve problems.
• They can reason using purely abstract thoughts, hypothetical scenarios, and logical propositions.
• They can evaluate logical arguments independently of whether the premises align with real-world facts or direct experience.

Therefore, concluding that penguins can fly based strictly on the logical premise provided, despite knowing the real-world reality, exemplifies the advanced deductive reasoning of the formal operational stage.