Answer:
Sean is in Formal Operational Stage of cognitive development.
Explanation:
Formal Operational Stage is the fourth stage of Piaget's cognitive development theory. The formal operational stage is 12 years and above covering the adolescence and adulthood. According to Piaget, the teenagers and adults started to think rationally and logically in this stage. However, the external environment influences such as sociocultural and economic influences may deeply affect the thinking process of teenagers and adults. In this case scenario, Sean was a teenager who has an African-American descent which makes him vulnerable to economic hardships and injustice by powerful people. Therefore, he exhibited a reaction of what he has has been enduring, and engage in riots. His cognitive development operations were negatively influenced by his circumstances.