In psychologist Jean Piaget's theory, by the stage, adolescents are able to engage in highly abstract thought and understand places, things, and events they have never seen. They can think about the future and evaluate different options or courses of action.

The correct answer to the following question will be "Formal operational".

Explanation:

That formal operational phase or stage starts at about twelve years of age and continues into adolescence or adulthood. When teenagers reach this level, they demonstrate the ability to memorize equations by manipulating thoughts in conceptual minds, without relying on specific exploitation.An Individual can do logical equations, think strategically, use conceptual logic, even visualize the consequence of actual actions.

C) germany is the anwser