Answer:
reason abstractly.
Step-by-step explanation:
Formal operational stage: In psychology, the term "formal operational stage" is one of the distinct stages in the cognitive development theory that includes a total of four stages and was proposed by a famous psychologist named Jean Piaget.
According to Piaget, the formal operational stage begins at the age of twelve years and lasts through adulthood. At this stage, an thinks in a more advanced or sophisticated manner. Adolescents at this stage gains capability to think abstractly by manipulating ideas and in the absence of any concrete manipulation.
In the question above, the given statement signifies "reason abstractly".