Final answer:
Piaget called the reasoning that characterizes adolescence formal operational thought, which is the fourth stage in Piaget's theory of cognitive development. This stage enables adolescents to think abstractly and solve problems using abstract thinking.
Step-by-step explanation:
Piaget called the reasoning that characterizes adolescence formal operational thought. This is the fourth and final stage in Piaget's theory of cognitive development, which occurs from about age 11 to adulthood. During this stage, adolescents move beyond concrete thinking and become capable of abstract thought, allowing them to consider multiple points of view, imagine hypothetical situations, and form new ideas. They can also use abstract thinking to problem solve and look at alternative solutions.