Stanley has the ability to use operations, what stage of cognitive development?

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Stanley has the ability to use operations, reversibility and logic. Stanley is in the stage of cognitive development.
a. preoperational. b. concrete operational. C. formal operational. d. sensorimotor.
The Formal Operational Stage

The Formal Operational Stage: 12 and Up

Teens begin to think more about moral, philosophical, ethical, social, and political issues that require theoretical and abstract reasoning. They begin to use deductive logic, or reasoning from a general principle to specific information.