Answer:
formal operational
Step-by-step explanation:
Formal operational stage: In psychology, the term formal operational stage is a part of Jean Piaget's theory of cognitive development in which he has mentioned four distinct stages. The formal operational stage is the last and the fourth stage in his theory and starts from approximately eleven or twelve years of an individual's life and lasts through adulthood.
In this stage, an adolescent gains the capability to think abstractly by manipulating ideas in his or her head in the absence of any dependence on the concrete manipulation.